Incompatible method signature change of FileUtils.readLine

The following commit https://github.com/apache/commons-io/commit/166dea37e810fcfa9c72cf1f107fd38cfb432486

changed the throws Signature of the FileUtils.readLine methods from "throws IOException" to "throws UncheckedIOException". This change results in compilation failures if the checked IOException was catched explicitly (`Unreachable catch block for IOException`).

Backwards incompatible API changes should only be done in major releases. I'd therefore like ask that this change is reverted and ideally a new minor release is provided as soon as possible.