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

components/settings/password/settings-button.js

@@ -1,4 +1,5 @@
 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