Update timeinterval/timeinterval.go
Update timeinterval/timeinterval.go

Co-authored-by: Julien Pivotto <df1ed88a312a603dfee9f157a90fa8f7f195ab59@gmail.com>
Signed-off-by: Ben Ridley <355023fe1c8f86a7ebed12a304e34c56a0753505@gmail.com>

prometheus/alertmanager,GoogleCloudPlatform/alertmanager,prometheus/alertmanager,GoogleCloudPlatform/alertmanager,GoogleCloudPlatform/alertmanager,GoogleCloudPlatform/alertmanager,prometheus/alertmanager,prometheus/alertmanager