Merge pull request #2 from muneeb-ali/patch-1

Update intro.rst

docs/intro.rst

@@ -33,7 +33,7 @@ To run tests::
 
 Fidelity to Original Paper
 ==========================
-The current implementation should be an accurate implementation of all aspects of the paper save one - in Section 2.3 there is the requirement that the original publisher of a key/value republish it every 24 hours.  This library does not do this (though you can easily do this manually).
+The current implementation should be an accurate implementation of all aspects of the paper except one - in Section 2.3 there is the requirement that the original publisher of a key/value republish it every 24 hours.  This library does not do this (though you can easily do this manually).
 
 
 .. _Twisted: https://twistedmatrix.com