haskell-gi-0.20.1: ChangeLog.md

### 0.20.1

	+ gtk-doc parser and haddock generator: while no means perfect,
	now the autogenerated bindings come with some reasonable
	autogenerated documentation.

	+ Many bugfixes. A particularly important one is for
	[issue 82](https://github.com/haskell-gi/haskell-gi/issues/82), which
	made compilation of
	[gi-glib](http://hackage.haskell.org/package/gi-glib) fail, for
	the latest version of gobject-introspection.