Bump version to 1.10

Bump version to 1.10

Changes since 1.9:

* *2020-04-23* Fix hook script execution order to match description from readme
* *2020-04-11* Handle negative gamma values (fixes #188)
* *2020-04-11* Sort approximate matches in detected profiles by quality of match
* *2020-01-31* Handle non-ASCII environment variables (fixes #180)
* *2019-12-31* Fix output positioning if the top-left output is not the first
* *2019-12-31* Accept negative gamma values (and interpret them as 0)
* *2019-12-31* Prefer the X11 launcher over systemd/udev configuration

Fixes #191