chore: remove line-break escapes in firebase private key

[devversion]

• Transforms the escaped line-breaks from the Firebase private key back into real line-breaks.
  This is necessary because the private key always contains line-breaks.

[devversion]

@jelbourn I wasn't able to verify this change locally since I don't know how Travis CI escapes the characters in their web interface.

Right now the payload mode isn't able to publish the results to firebase.

[jelbourn]

@devversion did you put the key in quotes in Travis, e.g.

?

[devversion]

@jelbourn Nope, do I need to?

[jelbourn]

@devversion I think so- I've always had to do that when entering a firebase access token

[devversion]

@jelbourn Interesting, let me try that and restart a build.

[jelbourn]

LGTM

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