Revert "doc build take version from git when package not installed"

This reverts commit 8fc971c.

We should not need this now that the rtd.org build is installing our
package via pip.

Author: dhellmann

docs/source/conf.py

@@ -14,15 +14,7 @@
 
 import datetime
 
-# Try to import the version from our package, but if that fails
-# because of the way the RTD build works fall back to at least using
-# the git tag information.
-try:
-    from virtualenvwrapper.version import version
-except ImportError:
-    import subprocess
-    p = subprocess.run(['git', 'describe'], stdout=subprocess.PIPE)
-    version = p.stdout.decode('utf-8').strip()
+import virtualenvwrapper.version
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
@@ -60,7 +52,7 @@
 # built documents.
 #
 # The short X.Y version.
-# version = "SEE IMPORTS ABOVE"
+version = virtualenvwrapper.version.version
 # The full version, including alpha/beta/rc tags.
 release = version