Merge pull request Python-Markdown#282 from llbit/patch-1

Pedantic edit in installation instructions

Author: Waylan Limberg

docs/install.txt

@@ -19,7 +19,7 @@ or
 
     easy_install markdown
 
-That's it! Your ready to [use](reference.html) Python-Markdown. Enjoy!
+That's it! You're ready to [use](reference.html) Python-Markdown. Enjoy!
 
 Installing on Windows {: #windows }
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