Release 1.20.7

New version: 1.20.7.

Release 1.20.6

New version: 1.20.6 (new deps).

Release 1.20.5

Removed obsolete `unsafe-perm`.

Release 1.20.4

Updated deps. New version: 1.20.4.

Release 1.20.3

New version: 1.20.3. Fixes #183.

Release 1.20.2

New version: 1.20.2. Fixes #180.

Release 1.20.1

Don't exclude vendors.

Release 1.20.0

Added linux headers required for abseil-cpp on Alpine.

Release 1.19.2

Minor style change: the test.

Release 1.19.1

Updated deps, README, new version: 1.19.1.