Release version 0.2.4

This mainly adds compatibility for Windows and also fixes some other
minor bugs, especially regarding module handle in `conf.py`.

Release version 0.2.3

* Fixed return codes of main() function and exit with non-zero status if
  no matching refs were found.
* Added some logging calls to the git module.
* Fixed bug where local branch was used to check the existence of files
  on remote branches.

Release version 0.2.2

Added additional checks to determine if a branch or tag contains both
the Sphinx source directory and the conf.py file. If that's not the
case, that branch or tag is skipped automatically and not copied to the
temporary directory. (PR sphinx-contrib#9)

Release v0.2.1

Fixes a bug regarding the handling of absolute output paths that became
more apparent due to the merge of PR sphinx-contrib#7.

Release v0.2.0

New feature:
-  Added support overriding configuration options via command line using
   placeholders.

Release v0.1.1

Fixes an issue with wrong config paths when -c is not specified on the
command line.

Release v0.1.0

This is the first release of sphinx-multiversion.