Update RELEASE.rst pip usage for cache avoidance (#495)

This is more aggressively cached by pip as of the new warehouse backend for PyPI.
pex-tool · May 23, 2018 · e835d92 · e835d92
1 parent 741de3e
commit e835d92
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/RELEASE.rst b/RELEASE.rst
@@ -51,7 +51,7 @@ Dogfood
 
 ::
 
-    $ pip install --upgrade pex
+    $ pip install --no-cache-dir --upgrade pex
     ...
     $ pex --version
     pex 1.1.1