Disabled for public repositories due to a negative credit balance

Hi guys,
I’m facing with a problem today: my credit balance is less than zero. I didn’t know that free plan for open source projects has credits and so limited builds.
The question is: how can i get more credits ? Or this is a bug and travis is free for open sources projects as i read when i started to use travis(about 1 years ago) ?

Thanks for the support in advice.

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