Version 0.13.0

• better handling for line directives in free form lexer (#248, @mrd)
• don't inline solo includes in relevant F77 parsers (#245, @RaoulHC)
• add -C=opts CLI option for passing CPP arguments (#250, @mrd)
• fix reformatting of 73 character long lines in naive mixed form reformatter
  (#251, @ksromanov)
• assume extended Fortran77Legacy rather than Fortran77 for *.f, *.for
  etc. files (#260)
• allow comment lines between continuation lines in F77 parser (in standard)
  (#257, @RaoulHC)
• refactor Fortran type & value representation & expression evaluator without
  Fortran kind-indexed GADTs; replace constant folder (#253, @raehik)