Fixing the optics-extra-0.4.2 issue

... with mtl-2.3 and transformers <0.6

Merge pull request well-typed#456 from well-typed/release-0.4.2

Release optics-extra-0.4.2 and optics-0.4.2

Merge pull request well-typed#456 from well-typed/release-0.4.2

Release optics-extra-0.4.2 and optics-0.4.2

Release optics-core-0.4.1, optics-extra-0.4.1, optics-th-0.4.1, optic…

…s-0.4.1 (well-typed#448)

Release template-haskell-optics-0.2 (well-typed#449)

Release indexed-profunctors-0.1.1 (well-typed#417)

Merge pull request well-typed#403 from well-typed/375-release-0.4

Add changelogs for 0.4 release

Merge pull request well-typed#348 from well-typed/template-haskell-op…

…tics-release

Release template-haskell-optics-0.1

Merge pull request well-typed#341 from well-typed/optics-th-0.3.0.2

Bump version of optics-th to 0.3.0.2

Bump version of optics-core and optics-th to 0.3.0.1 (well-typed#333)