Fix docstring

[ci skip]
Fix help output

[ci skip]
[Fix #91] Add support for Go programming language
Add unit tests for Go syntax checking
Add Robert Zaremba to credits

Thank you for your contributions, @robert-zaremba
Add a change log for all releases

[ci skip]
Update list of syntax checkers in README

[ci skip]
[Fix #72] Add support for checker options

Add `option` cell, and `flycheck-def-option-var` macro to declare syntax
checkers.
Print options in checker help
Add option for PHP CodeSniffer coding standard
Document config file vars as buffer local
Update tests to Flake8 message changes
Update channels before installing with PEAR
Declare the docstring argument number
Update the changelog
Add option filter for integer->string conversion
Add flake8 option for maximum complexity
Add flake8 option for maximum line length
Update changelog
Sort options alphabetically in syntax checker help