v0.7.0: Bump version to 0.7.0

Changes since 0.6.0:

• Add a @parentsection directive for sections (#96)
• Allow dots in setting names, like g:mysettings.var (#94)
• Fix UnicodeDecodeError on Windows for non-ASCII characters (#104)
• Fix autoload namespace detection issues on Windows (#106)
• Force POSIX '\n' line endings in output on all platforms (#108)