checkForUpdates should not output to stdout

[brandon-leapyear]

Meta:

CircleCI CLI Version:
0.1.22150

Operating System:
MacOS

CircleCI CLI Diagnostic:

---

Current behavior:

Running any circleci command will run brew outdated to check if it's out of date. If brew outdated returns a non-zero exit code, circleci will dump an error message to stdout:

circleci-cli/cmd/root.go

Lines 215 to 218 in 37e2fc3

	if err != nil {
	fmt.Printf("Error checking for updates: %s\n", err)
	fmt.Printf("Please contact support.\n\n")
	}

So if you're running circleci config pack .circleci/ > .circleci/config.yml, config.yml will now contain the error message at the top.

Expected behavior:

The checkForUpdate messages should go to stderr

When did this begin / Was this previously working?:

We hadn't hit this codepath before.

Additional Information: