Support Node v12.0.0

package.json

@@ -9,7 +9,7 @@
     "c++",
     "ffi"
   ],
-  "version": "1.1.0",
+  "version": "2.0.0",
   "author": "Nathan Rajlich <[email protected]> (http://tootallnate.net)",
   "repository": {
     "type": "git",
@@ -18,16 +18,16 @@
   "main": "./lib/struct.js",
   "license": "MIT",
   "scripts": {
-    "test": "node-gyp rebuild --directory test && mocha -gc --reporter spec"
+    "test": "node-gyp rebuild --directory test && mocha -gc-global --expose-gc --reporter spec"
   },
   "dependencies": {
-    "debug": "2",
+    "debug": "4",
     "ref": "1"
   },
   "devDependencies": {
-    "bindings": "~1.2.0",
+    "bindings": "~1.5.0",
     "nan": "2",
     "mocha": "*",
-    "ref-array": "~1.1.2"
+    "ref-array": "lxe/ref-array#node-12"
   }
 }