add support for 6.2 api

package.json

@@ -23,8 +23,9 @@
     "blanket": {
       "pattern": "specified in test/unit/coverage.js"
     },
-    "default_api_branch": "6.1",
+    "default_api_branch": "6.2",
     "supported_es_branches": [
+      "6.2",
       "6.1",
       "6.0",
       "5.6",
@@ -39,7 +40,6 @@
       "0.90"
     ],
     "unstable_es_branches": [
-      "6.2",
       "6.x",
       "master"
     ]