v0.3.8: Implement deprecation warnings

Generate deprecation warnings in mathoid if deprecated texvc commands are used.

Bug: T197842

Release version 0.3.7

v0.3.7

Bump version to 0.3.7

texvcjs for Mathoid 0.2.9

Merge pull request #8 from wikimedia/pegjs0.9

Pegjs0.9