fix encoding issue

AJMansfield · AJMansfield · commit 3ba5cd799992 · 2017-07-20T23:36:50.000-04:00
diff --git a/git/cmd.py b/git/cmd.py
@@ -593,6 +593,7 @@ def execute(self, command,
                   command, cwd, universal_newlines, shell)
         try:
             if type(istream) in {str, bytes}:
+                if type(istream) is str: istream = istream.encode('utf-8')
                 proc = Popen(command,
                              env=env,
                              cwd=cwd,
