Added "recursively" (#10)

Author: nabati

README.md

@@ -6,7 +6,7 @@
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-Changes the case of all keys in an object or array. In its simplest form it also changes the key itself if a string is passed in.
+Recursively changes the case of all keys in an object or array. In its simplest form it also changes the key itself if a string is passed in.
 
 ## Installation