Merge pull request #12 from garyb/additions

Restore `Alt` instance, add `fix` for `Codec'`

Merge pull request #11 from garyb/simpler

Make `Codec` much simpler

Merge pull request #10 from thomashoneyman/trh/purs-0.15

Update for PureScript 0.15

Merge pull request #9 from garyb/gh-actions

Switch to GH actions

Merge pull request #8 from thomashoneyman/master

Update for PureScript 0.14

Merge pull request #7 from garyb/codec-fn

Add `codec` helper function

Update README.md

Merge pull request #2 from garyb/forward-compose

Add forward composition operator

Merge pull request #1 from garyb/data

Move namespace to Data.Codec

Add README