Updated the build status badge to point to travis-ci.com

[Jawayria]

Updated the README file.
Build status badge is now pointing to 'travis-ci.com' instead of 'travis-ci.org'

JIRA: https://openedx.atlassian.net/browse/BOM-2089

[openedx-webhooks]

Thanks for the pull request, @Jawayria! I've created OSPR-5183 to keep track of it in JIRA, where we prioritize reviews. Please note that it may take us up to several weeks or months to complete a review and merge your PR.

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