[Readme] Update build status badges

The old Travis-CI badges are about a year old. These changes replace the links with those for Gitlab-CI.

Adapted from instructions at https://docs.gitlab.com/ee/user/project/badges.html#use-custom-badge-images.
This commit is contained in:
Ajinkya Dahale
2022-05-19 15:54:40 -04:00
committed by Uwe
parent f16f617dc8
commit 650210e2db

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