Add config param on browser deployment

src/browser.js

@@ -2,6 +2,7 @@ const steem = {
   api: require('./api'),
   auth: require('./auth'),
   broadcast: require('./broadcast'),
+  config: require('./config'),
   formatter: require('./formatter'),
 };
 

src/config.js

 const defaultConfig = require('../config.json');
+
 module.exports = (function () {
-    const config = defaultConfig;
-    const get = (key) => config[key];
-    const set = (key, value) => {
-        config[key] = value;
-    }
-    return { get, set };
-})()
+  const config = defaultConfig;
+  const get = (key) => config[key];
+  const set = (key, value) => {
+    config[key] = value;
+  };
+  return { get, set };
+})();
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