Update Readme

Add closing tags to img elements.

Author: bondz

README.md

@@ -2,16 +2,16 @@
 
 <p align="center">
   <a href="https://circleci.com/gh/bondz/react-static-google-map/tree/master">
-    <img src="https://circleci.com/gh/bondz/react-static-google-map/tree/master.svg?style=shield" alt="build status">
+    <img src="https://circleci.com/gh/bondz/react-static-google-map/tree/master.svg?style=shield" alt="build status" />
   </a>
   <a href="https://www.npmjs.com/package/react-static-google-map">
-    <img src="https://img.shields.io/npm/v/react-static-google-map.svg" alt="npm version">
+    <img src="https://img.shields.io/npm/v/react-static-google-map.svg" alt="npm version" />
   </a>
   <a href="https://github.com/bondz/react-static-google-map/blob/master/LICENSE.md">
-    <img src="https://img.shields.io/npm/l/react-static-google-map.svg" alt="license">
+    <img src="https://img.shields.io/npm/l/react-static-google-map.svg" alt="license" />
   </a>
   <a href="https://snyk.io/test/github/bondz/react-static-google-map">
-    <img src="https://snyk.io/test/github/bondz/react-static-google-map/badge.svg" alt="Vulnerability status">
+    <img src="https://snyk.io/test/github/bondz/react-static-google-map/badge.svg" alt="Vulnerability status" />
   </a>
 </p>