Clean up dependencies #7
                
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I don't know what happened there with
MIN_VERSION_mtl(2,3,0), but it prevented compilation on older GHCs, removing it fixes compilation, and I don't get any unused import warnings, across all GHC and mtl versions.The package now builds against all dependency versions that can be planned, given the fixes in this PR:
base >=4.11(GHC >=8.4) because in GHC 8.2,Data.Monoid.<>andData.Semigroup.<>used to be different identifiers, and then became one identifier. This change is difficult to support and not worth it IMO.fast-logger >=2.4.11because that's when Show LogStr was introduced, which we use.