Merge pull request GeekyAnts#2175 from tofugear/gravatar-proptypes-patch-1

missing import `prop-types` package

Author: SupriyaKalghatgi

src/basic/Gravatar.js

@@ -1,4 +1,5 @@
 import React from "react";
+import PropTypes from "prop-types";
 import { Image } from "react-native";
 import { connectStyle } from "native-base-shoutem-theme";
 import _ from "lodash";