Apply automatic eslint fixes

lib/cache/backend/fastly.js

@@ -2,7 +2,7 @@
 
 var FastlyPurge = require('fastly-purge');
 
-function FastlyCacheBackend(apiKey, serviceId) {
+function FastlyCacheBackend (apiKey, serviceId) {
     this.serviceId = serviceId;
     this.fastlyPurge = new FastlyPurge(apiKey, { softPurge: false });
 }
@@ -13,6 +13,6 @@ module.exports = FastlyCacheBackend;
  * @param cacheObject should respond to `key() -> String` method
  * @param {Function} callback
  */
-FastlyCacheBackend.prototype.invalidate = function(cacheObject, callback) {
+FastlyCacheBackend.prototype.invalidate = function (cacheObject, callback) {
     this.fastlyPurge.key(this.serviceId, cacheObject.key(), callback);
 };

lib/cache/backend/varnish-http.js

@@ -2,7 +2,7 @@
 
 var request = require('request');
 
-function VarnishHttpCacheBackend(host, port) {
+function VarnishHttpCacheBackend (host, port) {
     this.host = host;
     this.port = port;
 }
@@ -13,7 +13,7 @@ module.exports = VarnishHttpCacheBackend;
  * @param cacheObject should respond to `key() -> String` method
  * @param {Function} callback
  */
-VarnishHttpCacheBackend.prototype.invalidate = function(cacheObject, callback) {
+VarnishHttpCacheBackend.prototype.invalidate = function (cacheObject, callback) {
     request(
         {
             method: 'PURGE',
@@ -22,7 +22,7 @@ VarnishHttpCacheBackend.prototype.invalidate = function(cacheObject, callback) {
                 'Invalidation-Match': '\\b' + cacheObject.key() + '\\b'
             }
         },
-        function(err, response) {
+        function (err, response) {
             if (err || response.statusCode !== 204) {
                 return callback(new Error('Unable to invalidate Varnish object'));
             }