Update README.md

Author: guritfaq

README.md

@@ -1,6 +1,6 @@
 # CodeRabbit Pro
 
-This is an old version of [CodeRabbit](http://coderabbit.ai) and is now in the mainatance mode.
+This is an old version of [CodeRabbit](http://coderabbit.ai) and is now in the maintenance mode.
 We recommend installing the Pro version from [CodeRabbit](http://coderabbit.ai). The Pro version is a total redesign and offers significantly better reviews that learn from your usage and improve over time. CodeRabbit Pro is free for open source projects. 
 
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