Bump to version 1.26

Signed-off-by: Miroslav Vadkerti <[email protected]>

Bump version to 1.25 (#116)

Signed-off-by: Miroslav Vadkerti <[email protected]>

Bump version to 1.24 (#115)

Bump to 1.23 (#110)

Bump to 1.22 (#106)

Bump version to 1.21

Forgotten commit of "Support structured logging to stderr" (#99)

Bump version to 1.19.1 (#87)

Add py.typed to let mypy use gluetool for type checks (#85)

When used as a 3rd-party library, py.typed must exist, oterwise mypy
doesn't consider gluetool as "PEP 561"-compatible, and skips it.

Six's exec_ does not have globals/locals kwargs (#84)

Despite what documentation says...