Fix wording in CHANGELOG

Author: duailibe

CHANGELOG.md

@@ -27,15 +27,15 @@
     return "one";
   }
 
-  // Output (Prettier stable)
+  // Output (Prettier 1.18.0)
   interface Interface1<T,> {
     one: "one";
   }
   function function1<T,>() {
     return "one";
   }
 
-  // Output (Prettier master)
+  // Output (Prettier 1.18.1)
   interface Interface1<T> {
     one: "one";
   }