0.16

This releases adds support for gcc 7 and gcc 8 (along with continued support for gcc 4.6, 4.7, 4.8, 4.9, 5 and 6).

The upstream location for the plugin has moved from fedorahosted.org to https://github.com/davidmalcolm/gcc-python-plugin

Additionally, this release contains the following improvements:

add :pygcc.RichLocation for GCC 6 onwards
:pygcc.Location
- add :py~gcc.Location.caret, :py~gcc.Location.start, :py~gcc.Location.finish attributes for GCC 7 onwards
- add :pygcc.Location.offset_column method