docs: march updates

dev: add gosec test case

add gosec files

docs: remove extra bracket

don't crash when staticcheck panics

docs: update changelog

Fix golangci#331: fix errcheck "ignore" config directive.

Make tests for "ignore" and "exclude" directives.
Mark all hidden command-line options as deprecated.

Fix golangci#318: better validate linters and help commands

remove unnecessary command from Dockerfile

fix golangci#277, fix golangci#260: fix crash

Fix crash because of parallel access to ssa.Program