Fix issue with nil value as function parameter and return parameter, on inspections
Merge pull request #569 from josehsantos/fix_520

Fix: Improve functionCall and functionReturn inspections to handle the nil values correctly. (fixes #520)
Fix nil assignability
Merge pull request #570 from m0sth8/master

Fix nil assignability
Fix bidirectional channel assignability

issue #454
Merge pull request #571 from m0sth8/channel_inspection

Fix bidirectional channel assignability (fixes #454)
add an inspection to check the type of index, in index expressions
Merge pull request #572 from josehsantos/index_expression_inspection

Add an inspection to check the type of index, in index expressions