Update to beta release of pyyaml for #511
Merged
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CVE-2017-18342 has been issued. Mbed OS also now pins this dependency: https://github.com/ARMmbed/mbed-os/blob/master/requirements.txt#L7. This is causing some issues in their CI, so I'm proposing this change here. Happy to discuss alternatives if you feel any are appropriate!