Parsing fails when only any output values are added

[johnmanjiro13]

WHAT

When I add an output value only and run terraform plan, tfnotify caused an error and return exit code 1.

WHY

terraform version: 1.0.0

tfnotify checks texts with regular expression below.
https://github.com/mercari/tfnotify/blob/master/terraform/parser.go#L64
But when we ran plan adding any output values only, terraform's output didn't contain Plan: or No changes and tfnotify failed to parse.
Terraform's output result is a like below:

pagerduty_schedule.secondary: Refreshing state...
pagerduty_schedule.primary: Refreshing state...
pagerduty_team_membership.team[0]: Refreshing state...
pagerduty_team_membership.team[1]: Refreshing state...
pagerduty_escalation_policy.team: Refreshing state...
pagerduty_service.team: Refreshing state...
pagerduty_service_integration.datadog: Refreshing state...

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Changes to Outputs:
  + my_another_project_name = "my-another-project"

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Thanks!