Fix typo in README.md
Fix typo in README.md

An expo.io link is broken.
original:5acd165ffb25aa3aa18eedaaa5b4877995e2bd34@geekyants/nativebase-kitchenSink
corrected:5acd165ffb25aa3aa18eedaaa5b4877995e2bd34@geekyants/nativebasekitchensink

GeekyAnts/NativeBase,GeekyAnts/NativeBase,GeekyAnts/NativeBase,GeekyAnts/NativeBase,GeekyAnts/NativeBase