fixed typo
Update README.md

removed inactive release maintainer
Fix for #183, refactored the windows and unix locations out of BinFolderOfDefaultFSharpCompiler function for clarity.
Added a Environment.runningOnMono detection to early abort the windows detection on mono.
Removed redundant match case.
Merge pull request #184 from 7sharp9/master

Fix for issue 183
Bug fix for script-only completion

Output mode was not set to JSON unless a project was loaded
updated addin release section with additional information.