[pygobject] Fix title underline too short

[Christoph Reiter <creiter src gnome org>]

commit 86d59955c620eae0f59c74dfffa3be65223352e4
Author: Dan Yeaw <dan yeaw me>
Date:   Wed Mar 7 21:43:08 2018 -0500

    Fix title underline too short
    
    Signed-off-by: Dan Yeaw <dan yeaw me>

 docs/devguide/dev_environ.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/docs/devguide/dev_environ.rst b/docs/devguide/dev_environ.rst
index fe2bcc5d..707cda14 100644
--- a/docs/devguide/dev_environ.rst
+++ b/docs/devguide/dev_environ.rst
@@ -150,7 +150,7 @@ TODO: currently no way to install `pyenv`_ in Windows. So we'll use a normal
 .. _install-pipsi:
 
 Install `pipsi`_
-=============
+================
 
 `pipsi`_ is a wrapper around virtualenv and pip which installs
 scripts provided by python packages into separate virtualenvs to shield them