Release new version to PyPI

[resolritter]

The latest version on PyPI, 1.1.1, does not have commit c2c980095c9e66d835210b62eefd063e3590671f. Without that commit, files with the .opus extension are not supported, as also mentioned in https://github.com/chaudum/rgain3/issues/13#issuecomment-1112870487. 1.1.1 works as follows:

$ replaygain sample.opus
sample.opus: not supported, ignoring it

With c2c980095c9e66d835210b62eefd063e3590671f I am able to process the file as expected.