Component RCTAutoComplete declared `PropTypes` instead of `propTypes`

[mikeyamato]

Received this warning after installing the package onto Xcode and running it. Since it's just a warning and not a red screen I'm hoping it's a non-issue.

My setup...

"react": "16.6.3",
"react-native": "0.57.8",    
"react-native-autocomplete": "^0.4.0",

and Xcode version 10.1 (10B61).