README.md in yt-audit-0.4.0 vs README.md in yt-audit-0.5.0

@@ -14,10 +14,10 @@
 
 ## Development
 
     $ bin/setup
 
-    $ YT_API_KEY="123456789012345678901234567890123456789" rake
+    $ YT_SERVER_API_KEY="123456789012345678901234567890123456789" rake
     $ open coverage/index.html
 
     $ yardoc
     $ open doc/index.html