Update bower.json

Update vaadin-grid dependency to 1.2.x

Author: jouni

bower.json

@@ -25,7 +25,7 @@
     "**/tests"
   ],
   "dependencies": {
-    "vaadin-grid": "vaadin/vaadin-grid#1.1.x",
+    "vaadin-grid": "vaadin/vaadin-grid#1.2.x",
     "vaadin-combo-box": "vaadin/vaadin-combo-box#1.1.x",
     "vaadin-icons": "vaadin/vaadin-icons#1.0.x",
     "vaadin-date-picker": "vaadin/vaadin-date-picker#1.1.x",