v0.3.2 (2018-07-09)

• Gracefully deal with empty/malformed input #66
• Add Code of Conduct #63
• Add MANIFEST.in #64
• Document git filter-branch use case in README (#28, @belteshassar)
• Flush output when using -t (#67, @tnilanon)
• Add nbformat and setuptools >= 30 to setup_requires (#67, @tnilanon)
• Use travis_retry (#67, @tnilanon)
• Drop support for Python 3.3 (no longer supported by setuptools)