* Provide a clearer error message when a required tagKey for a constructor is missing, thanks to Guru Devanla.
The error message now looks like this: `Error in $: parsing Types.SomeType failed, expected Object with key "tag" containing one of ["nullary","unary","product","record","list"], key "tag" not found`
* Add `formatPath` and `formatRelativePath` functions to turn a `JSONPath` into a `String`, thanks to Robbie McMichael
* Expose `(<?>)`, `JSONPath` and `JSONPathElement(..)` from `Data.Aeson.Types`. Previously only available through internal modules. Thanks to Luke Clifton.
* Support for base-compat 0.11, thanks to Ryan Scott.
* Travis build for GHC 8.8, thanks to Oleg Grenrus.
