Remove maxAge from downloads link so it doesn't cache

Author: beefancohen

README.md

@@ -15,7 +15,7 @@
     <img src='https://coveralls.io/repos/github/evcohen/eslint-plugin-jsx-a11y/badge.svg?branch=master' alt='Coverage Status' />
   </a>
   <a href='https://npmjs.org/package/eslint-plugin-jsx-a11y'>
-    <img src='https://img.shields.io/npm/dt/eslint-plugin-jsx-a11y.svg?maxAge=2592000'
+    <img src='https://img.shields.io/npm/dt/eslint-plugin-jsx-a11y.svg'
     alt='Total npm downloads' />
   </a>
 </p>