Upgrading tc-core-lib

To take care of email be available at root level.

Author: vikasrohit

package.json

@@ -74,7 +74,7 @@
     "pg-native": "^3.0.0",
     "sequelize": "^5.8.7",
     "swagger-ui-express": "^4.0.6",
-    "tc-core-library-js": "github:appirio-tech/tc-core-library-js#v2.6.3",
+    "tc-core-library-js": "github:appirio-tech/tc-core-library-js#v2.6.6",
     "traverse": "^0.6.6",
     "urlencode": "^1.1.0",
     "yamljs": "^0.3.0"