v0.50

 - Update libgit2 to 057126c (GH#153)
 - Removed Remote methods (Incompatible change):
    + is_url_supported()
 - Removed Config methods (Incompatible change):
    + refresh()
 - Split Remote -> name into Remote -> name and Remote -> rename
   (Incompatible change)
 - Added fallbacks for overloads (GH#151)
 - Handle no EOF markers when printing diffs
 - Added Note methods (GH#154):
    + author
    + committer