Updated to version 0.7.2

0.7.2 (2020-05-01)
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- Garuda has been fine-tuned by hand for balanced cubic splines
  and optimal quadratic splines.
- All families now use OS/2 Typo metrics instead of just Win/Hhea metrics.
- The OS/2 Typo metrics of each family have been normalized for equal line
  spacing on all faces, esp. regular and bold.
- Switch to Python 3 on build scripts.
- Fix a TDS zipball naming issue in the generated CTAN zipball.

(scole)