Release 1.22.1

Switched to good old C checks:

* Some compilers had problems with `starts_with()`.

Release 1.22.0

New version: 1.22.0.

Release 1.21.5

New version: 1.21.5.

Release 1.21.4

Official Docker Node images do not support Debian Buster anymore. Upg…

Release 1.21.3

New version: 1.21.3 (an empty string regression).

Release 1.21.2

New release: 1.21.2.

Release 1.21.1

More and more Abseil files.

Release 1.21.0

New version: 1.21.0.

Release 1.20.12

New version: 1.20.11.

Release 1.20.11

New version: 1.20.11.