version bump
Fixed OS dependent FilePath conversion.

In appeares that system-filepath:Filesystem.Path.CurrentOS.encode
has platform specific result type, so on Windows and MacOS we
catched problems with types.
Thanks for the Dougal Stanton for pointing out the origin of the
problem.
X-GITHUB-BUG: #23
X-GITHUB-URL: https://github.com/qnikst/imagemagick/issues/23