Update README intro

README.md

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-defn-spec lets you create Clojure Specs inline with your `defn`, rather than having to write a separate `fdef` and keep it synchronized with the function definition. The syntax (and implementation) has been borrowed from [Schema](https://github.com/plumatic/schema), so if you've used that before, this should be very familiar.
+defn-spec lets you create Clojure Specs inline with your `defn`. This is faster and more concise than writing a separate `fdef` and keeping it synchronized with the function definition. The syntax (and implementation) has been borrowed from [Schema](https://github.com/plumatic/schema), so if you've used that before, this should be very familiar.
 
 Instead of writing your spec separately: