Add GET method for TriggerCollection

Added GET method for retrieving list of Triggers from Telemetry service

Tested:
- Added single Trigger and requested result from bmcweb via
  /redfish/v1/TelemetryService/Triggers
- Added multiple Triggers numeric and discrete, and requested results
  from bmcweb via /redfish/v1/TelemetryService/Triggers
- Verified uri /redfish/v1/TelemetryService/Triggers by using
  Redfish-Service-Validator with no Triggers/empty Collection (passed)

Signed-off-by: Lukasz Kazmierczak <lukasz.kazmierczak@intel.com>
Change-Id: Ide00eb44901ea1b97b80fc5c5ddfd97e393d4a04
diff --git a/scripts/update_schemas.py b/scripts/update_schemas.py
index 903afb7..63b441e 100755
--- a/scripts/update_schemas.py
+++ b/scripts/update_schemas.py
@@ -93,6 +93,7 @@
     'TaskService',
     'TelemetryService',
     'Thermal',
+    'TriggersCollection',
     'UpdateService',
     'VLanNetworkInterfaceCollection',
     'VLanNetworkInterface',