docs(git): Fix numpy-style docs

Having a handing numpy attribute without a description at the end
of a docstring leads to an empty line.

See also:
- daizutabi/mkapi#22
- daizutabi/mkapi#23

Author: tony

libvcs/git.py

@@ -367,7 +367,8 @@ def remotes(self, flat=False):
 
         Returns
         -------
-        dict
+        dict :
+            dict of git upstream / remote URLs
         """
         remotes = {}
 
@@ -524,7 +525,8 @@ def get_git_version(self):
 
         Returns
         -------
-        str
+        str :
+            git version
         """
         VERSION_PFX = 'git version '
         version = self.run(['version'])