Bring back original Logger

Fix hlint warnings

Remove redundant constraint

Revert 1 commits

f58f5f0 'ExternsDiff: normalize type'

Update ExternsDiff.checkUsage, add tests

Merge pull request #5 from restaumatic/v0.15.15-restaumatic

Bump restaumatic fork to V0.15.15

Update Externs.hs

Merge pull request #3 from restaumatic/restaumatic-0.15.11

Restaumatic 0.15.11

Remove ;13u

Remove Show