Merge pull request #10 from gomicro/update

Go mod updates

Merge pull request #8 from gomicro/context

Adding in context

Merge pull request #7 from gomicro/callback

Callback blocker

Merge pull request #3 from gomicro/minor-readme-update

minor update to readme

Merge pull request #1 from gomicro/multiblocker

Multiblocker and DB Blocker