[1.5.x] Added a note about pip upgrade flag.

Thanks Jannis Leidel for the suggestion. Backport of 0e45f75 from master
django · May 22, 2013 · 194eace · 194eace
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commit 194eace
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diff --git a/docs/howto/upgrade-version.txt b/docs/howto/upgrade-version.txt
@@ -54,7 +54,7 @@ The most convenient way is to use pip_:
 
 .. code-block:: bash
 
-   pip install Django
+   pip install -U Django
 
 pip_ also automatically uninstalls the previous version of Django.