test(leadfoot): temporarily disable IE testing

Author: jason0x43

packages/leadfoot/intern.json

@@ -48,8 +48,8 @@
         "node",
         { "browserName": "chrome", "version": "latest" },
         { "browserName": "firefox", "version": "latest" },
-        { "browserName": "safari", "version": "latest" },
-        { "browserName": "internet explorer", "version": "latest" }
+        { "browserName": "safari", "version": "latest" }
+        // { "browserName": "internet explorer", "version": "latest" }
       ],
       "tunnel": "browserstack"
     },