[CHANGELOG.md] v3.1.4 updates

[README.md] update badges with new GH Actions

v3.1.1 updates

Merge pull request #25 from source-foundry/dev

v3.1.0

Merge pull request #24 from source-foundry/dev

Add baseline to baseline distance calculations across typo, hhea, win metrics, add OS/2.fsSelection USE_TYPO_METRICS bit setting

Merge pull request #21 from source-foundry/py3

Python 3 updates, eliminate Python 2.7 support

Merge pull request #19 from source-foundry/dev

v1.0.1

updated changelog