Small README improvements

README.md

@@ -7,6 +7,7 @@ may be integrated to [coin](https://code.ffdn.org/ffdn/coin).
 
 Install it
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+Be sure to use python3.
 
     sudo apt-get install python virtualenvwrapper
     mkvirtualenv transparency
@@ -22,7 +23,7 @@ Set your organization name :
 
 Create database:
 
-    ./manage migrate
+    ./manage.py migrate
 
 Run it
 ------