update edx-ui-toolkit version

package.json

@@ -7,7 +7,7 @@
     "backbone-validation": "~0.11.5",
     "coffee-script": "1.6.1",
     "edx-pattern-library": "0.18.0",
-    "edx-ui-toolkit": "1.5.0",
+    "edx-ui-toolkit": "1.5.1",
     "jquery": "~2.2.0",
     "jquery-migrate": "^1.4.1",
     "jquery.scrollto": "~2.1.2",