There is a patch in the upstream github project, merged to master branch, but not released:
https://github.com/milkypostman/powerline/pull/194 -- Gerald Turner <gtur...@unzane.com> Encrypted mail preferred! OpenPGP: 4096R / CA89 B27A 30FA 66C5 1B80 3858 EC94 2276 FDB8 716D
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