Release 0.9.6

[jerel]

Fixes two bugs:

• On really long type names the formatter can break a function return's impl Stream<Item = Result<Foo, Bar>,> into two lines with a trailing comma. Our macro parser didn't expect that and would complain about finding a comma instead of >.
• Compiling on Windows toolchains would complain about c_long for i64 because Windows might only use 32 bits for c_long.