Adds prop types to the project & and uses them in SettingsButton component

components/settings/password/settings-button.js

 import React from 'react'
+import PropTypes from 'prop-types'
 
 import { TouchableOpacity } from 'react-native'
 import AppText from '../../app-text'
@@ -20,4 +21,9 @@ const SettingsButton = ({ children, ...props }) => {
   )
 }
 
+SettingsButton.propTypes = {
+  onPress: PropTypes.func.isRequired,
+  disabled: PropTypes.bool
+}
+
 export default SettingsButton
\ No newline at end of file

package.json

@@ -26,6 +26,7 @@
     "nodejs-mobile-react-native": "^0.3.0",
     "object-path": "^0.11.4",
     "obv": "0.0.1",
+    "prop-types": "^15.6.2",
     "react": "16.4.1",
     "react-native": "~0.56.0",
     "react-native-calendars": "^1.19.3",