Bump version to 1.6.0 (#108)

Simplify and fix countdown display skipping seconds (#94)

- Simplify the tick timer code by using round() instead of floor() to handle the variance in exact fire times
- Bump version to 1.5.5

Co-authored-by: Ali Karbassi <ali@karbassi.com>

Use a fixed-width font for less jank (#86)

- Change to monospacedDigitSystemFont
- Remove old version checks
- Update build target to 10.11, as set by the project
- Bump version to 1.5.4

Fixes #85

Bump version to 1.5.3 (#81)

Bump version to 1.5.2 (#76)

Fix buggy mouse control (#72)

* Fix buggy mouse control

Fixes #71

* Update version to 1.5.1

Bump version to 1.5.0 (#70)

- Bump version to 1.5.0
- Add Credits
- Add app category as 'Utilities'

Added build instructions

Bump to 1.3

Dump to 1.2