Update sinon and sinon-chai dependencies

package.json

@@ -65,8 +65,8 @@
     "rollup-plugin-node-resolve": "2.0.0",
     "shelljs": "~0.7.5",
     "shx": "~0.2.1",
-    "sinon": "~1.17.5",
-    "sinon-chai": "~2.8.0",
+    "sinon": "~2.1.0",
+    "sinon-chai": "~2.9.0",
     "smash": "0.0",
     "svg-sprite": "1.3.6",
     "uglify-js": "~2.8.10",

test/spec/ui/fields/wikipedia.js

@@ -22,7 +22,7 @@ describe('iD.uiFieldWikipedia', function() {
             }
         };
 
-        sinon.stub(context, 'selectedIDs', function() { return [selectedId]; });
+        sinon.stub(context, 'selectedIDs').callsFake(function() { return [selectedId]; });
     });
 
     afterEach(function() {