doc: update contributing guide

CONTRIBUTING.md

@@ -1,32 +1,27 @@
 # Contributing
 
-Please note we have a [code of conduct](CODE_OF_CONDUCT.md), please follow it in all your interactions with the project.
+Please note, we have [code of conduct](CODE_OF_CONDUCT.md), please follow it in all your interactions with the project.
 
 ## Open Issue
 
-1. Before proceed please do:
+1. Before proceed, please do:
     - check [Troubleshooting Q&A](https://github.com/skylot/jadx/wiki/Troubleshooting-Q&A) section on wiki
     - search existing issues by exception message
 
-2. Describe error
-    **Describe error**
+2. Describe error:
     - full name of method or class with error
     - full java stacktrace (no need to copy method fallback code (commented pseudocode))
     - **IMPORTANT!:** attach or provide link to apk file (double check apk version)
 
-      **Note**: GitHub don't allow attach files with `.apk` extension, but you can change extension by adding `.zip` at the end :)
+	  **Note**: GitHub don't allow attaching files with `.apk` extension, but you can change extension by adding `.zip` at the end :)
 
 
 ## Pull Request Process
 
-1. Please don't submit any code style fixes, dependencies updates or other changes which are not fixing any issues.
+1. Please don't submit any code style fixes or dependencies updates changes.
 
-1. Before start working on PR please discuss the change you wish to make via issue. PR without corresponding issue will be rejected.
-
-1. Use only features and API from Java 8 or below.
-
-1. If possible don't add additional dependencies especially if they are big.
+1. Use only features and API from Java 11 or below.
 
 1. Make sure your code is correctly formatted, see description here: [Code Formatting](https://github.com/skylot/jadx/wiki/Code-Formatting).
 
-1. Make sure your changes is passing build: `./gradlew clean build dist`
+1. Make sure your changes are passing build: `./gradlew clean build dist`