v3, simplelru compatibility

What's Changed

• Bump go modules, update github workflows by @paskal in #5
• Add difference with hashicorp/golang-lru to readme by @paskal in #9
• Bump CI actions, use single .golangci.yml file for all versions by @paskal in #12
• Add v3 compatible with simplelru by @paskal in #10

Full Changelog: v1.0.0...v3.0.0