diff --git a/.travis.yml b/.travis.yml
index fdf3728..e8414d3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: swift
-osx_image: xcode8.1
+osx_image: xcode10.1
 branches:
   only:
     - master
@@ -9,10 +9,10 @@ env:
   - PROJECT_NAME="Noted.xcodeproj"
   - IOS_FRAMEWORK_SCHEME="Noted"
 
-  - IOS_SDK=iphonesimulator10.1
- 
+  - IOS_SDK=iphonesimulator12.1
+
   matrix:
-  - DESTINATION="OS=10.1,name=iPhone 6S Plus"     SCHEME="$IOS_FRAMEWORK_SCHEME"     SDK="$IOS_SDK"     RUN_TESTS="YES"
+  - DESTINATION="OS=12.1,name=iPhone 6S Plus"     SCHEME="$IOS_FRAMEWORK_SCHEME"     SDK="$IOS_SDK"     RUN_TESTS="YES"
 
 script:
   - set -o pipefail
@@ -26,4 +26,4 @@ script:
 
   - xcodebuild -project "$PROJECT_NAME" -scheme "$SCHEME" -sdk "$SDK" -destination "$DESTINATION" -configuration Release ONLY_ACTIVE_ARCH=NO build | xcpretty;
 after_success:
-  - bash <(curl -s https://codecov.io/bash)
\ No newline at end of file
+  - bash <(curl -s https://codecov.io/bash)
diff --git a/Noted.xcodeproj/project.pbxproj b/Noted.xcodeproj/project.pbxproj
index ca8b978..641fb16 100644
--- a/Noted.xcodeproj/project.pbxproj
+++ b/Noted.xcodeproj/project.pbxproj
@@ -188,16 +188,19 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0720;
-				LastUpgradeCheck = 0800;
+				LastUpgradeCheck = 1010;
 				ORGANIZATIONNAME = Nodes;
 				TargetAttributes = {
 					272F1E111C6A4A250098F620 = {
 						CreatedOnToolsVersion = 7.2.1;
-						LastSwiftMigration = 0800;
+						DevelopmentTeam = M92A6H7EPZ;
+						LastSwiftMigration = 1010;
+						ProvisioningStyle = Automatic;
 					};
 					272F1E1B1C6A4A250098F620 = {
 						CreatedOnToolsVersion = 7.2.1;
-						LastSwiftMigration = 0800;
+						DevelopmentTeam = M92A6H7EPZ;
+						LastSwiftMigration = 1010;
 					};
 				};
 			};
@@ -278,14 +281,22 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
@@ -328,14 +339,22 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
@@ -369,8 +388,11 @@
 			buildSettings = {
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ENABLE_MODULES = YES;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
+				CODE_SIGN_STYLE = Automatic;
 				DEFINES_MODULE = YES;
+				DEVELOPMENT_TEAM = M92A6H7EPZ;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
@@ -380,9 +402,11 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.nodes.Noted;
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				PROVISIONING_PROFILE_SPECIFIER = "";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -391,8 +415,11 @@
 			buildSettings = {
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ENABLE_MODULES = YES;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
+				CODE_SIGN_STYLE = Automatic;
 				DEFINES_MODULE = YES;
+				DEVELOPMENT_TEAM = M92A6H7EPZ;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
@@ -402,8 +429,10 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.nodes.Noted;
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				PROVISIONING_PROFILE_SPECIFIER = "";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -411,11 +440,13 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_CODE_COVERAGE = NO;
+				DEVELOPMENT_TEAM = M92A6H7EPZ;
 				INFOPLIST_FILE = NotedTests/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.nodes.NotedTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -423,11 +454,13 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_CODE_COVERAGE = NO;
+				DEVELOPMENT_TEAM = M92A6H7EPZ;
 				INFOPLIST_FILE = NotedTests/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.nodes.NotedTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
diff --git a/Noted.xcodeproj/xcshareddata/xcschemes/Noted.xcscheme b/Noted.xcodeproj/xcshareddata/xcschemes/Noted.xcscheme
index 157e71f..2d1dd87 100644
--- a/Noted.xcodeproj/xcshareddata/xcschemes/Noted.xcscheme
+++ b/Noted.xcodeproj/xcshareddata/xcschemes/Noted.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0800"
+   LastUpgradeVersion = "1010"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -26,8 +26,7 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES"
-      codeCoverageEnabled = "NO">
+      shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
          <TestableReference
             skipped = "NO">
diff --git a/Noted/Classes/Noted.swift b/Noted/Classes/Noted.swift
index db0f4c5..6cfbce7 100644
--- a/Noted/Classes/Noted.swift
+++ b/Noted/Classes/Noted.swift
@@ -21,7 +21,7 @@ public class Noted {
         notedQueue.sync {
             values = self._observers.allObjects
         }
-        return values.flatMap({ $0 as? NoteObserver })
+        return values.compactMap({ $0 as? NoteObserver })
     }
     
     public init() {}