Create Flower 0.17 release notes (adap#854)

Co-authored-by: Pedro Porto Buarque de Gusmão <pedropgusmao@gmail.com>

Adjust version in changelog (adap#728)

Prepare 0.15.0 release (adap#677)

Release notes for Flower 0.14.0 (adap#635)

Update changelog for release (adap#566)

Finalize release notes for v0.12.0 (adap#513)



Co-authored-by: Daniel J. Beutel <daniel@adap.com>

Fix version in changelog (adap#496)

Upgrade pip to 20.2.4 (adap#466)