Release 3.0: Raise exception when working tree required but missing*

This release contains a number of minor changes and one bigger change
that is technically backwards incompatible, although I don't expect it
to bite any real life use cases. Anyway, refer to the relevant commit
for more details: 7511246.

vcs_repo_mgr/__init__.py

@@ -111,7 +111,7 @@
 )
 
 # Semi-standard module versioning.
-__version__ = '2.0.1'
+__version__ = '3.0'
 
 USER_CONFIG_FILE = '~/.vcs-repo-mgr.ini'
 """The location of the user-specific configuration file (a string, parsed using :func:`.parse_path()`)."""