Adds go module support /v4 (golang-jwt#41)

Additionally, added `staticcheck` for basic static code analysis (golang-jwt#44)

Co-authored-by: Christian Banse <[email protected]>

Prepare release 3.2.2 (golang-jwt#42)

Update VERSION_HISTORY.md and MIGRATION_GUIDE.md (golang-jwt#27)

* Update VERSION_HISTORY.md
* Updated README and migration
* Added replacement command

documentation around expected key types

3.1.0 changelog

Merge pull request golang-jwt#77 from dgrijalva/release_3_0_0

Release 3.0.0

release notes

version history update

version history