added wip signals to params file

Author: sgsmob

safegraph/tests/params.json.template

@@ -8,5 +8,8 @@
   "aws_secret_access_key": "",
   "aws_default_region": "",
   "aws_endpoint": "",
-   "wip_signal" : ""
+  "wip_signal" : ["median_home_dwell_time_7d_avg",
+                  "completely_home_prop_7d_avg",
+                  "part_time_work_prop_7d_avg",
+                  "full_time_work_prop_7d_avg"]
 }