httpGet: accept 2nd parameter options

src/httpGet.js

@@ -1,4 +1,4 @@
-function httpGet (url, callback) {
+function httpGet (url, options, callback) {
   var xhr = new XMLHttpRequest()
   xhr.open('get', url, true)
   xhr.responseType = 'text'

src/wikidata.js

@@ -13,7 +13,7 @@ function wikidataLoad (id, callback) {
   }
   loadClash[id] = []
 
-  httpGet('https://www.wikidata.org/wiki/Special:EntityData/' + id + '.json', function (err, result) {
+  httpGet('https://www.wikidata.org/wiki/Special:EntityData/' + id + '.json', {}, function (err, result) {
     if (err) {
       return callback(err, null)
     }