🔧 Fix cyclomatic complexity warning

🎉 v1.5.2

🎉 v1.5.0

Cleanup for v1.5.0

Project upgrade, stability improvements, new features (MonitorControl#59

)

PR MonitorControl#59 with enhancements and fixes (Changes done by @JoniVR):

- Code migration to **Swift 4.2**
- **Fixed** the **MonitorControl scheme** which was gone for me
- **Updated the screenshots and readme**
- **Added a feature that detects the default sound output device and only intercepts when an external display is set as default output**, so Airpods, internal macbook volume and other non-monitor devices will be ignored (MonitorControl#48, MonitorControl#15)
- **Fixed app unresponsiveness and high CPU on launch** (might be related to MonitorControl#50, MonitorControl#37, please do keep in mind that on initial launch there will still be a little unresponsiveness because the underlying framework - called [ddcctl](https://github.com/kfix/ddcctl) - attempts to read your volume settings 10 times)
- Added a **version and build number** to the main preferences panel:
![menugeneral](https://user-images.githubusercontent.com/7591717/51052474-0c4c7500-15d7-11e9-883d-804051577bc7.png)
- Added a build script that increases the build number on each run. Version number still needs to be set manually.
- refactored some parts of the code to make it a bit more readable.

🎉 release 1.3.1

- code cleanup
- add feature that automatically detects if monitor or other devices (for example Airpods) are being used and ignores volume control for other devices (meaning they can be controlled as they normally would)

🎉 release 1.3

- fixed unresponsiveness at startup
- updated to Swift 4.2
- updated dependencies

🔧 Fix function keys not working and retry more often when getting val…

…ues. (MonitorControl#21)

* Update `ddcctl` submodule.

* Update dependencies.

* Enable displays by default.

* Retry more often to get values from display.

* Only print when debugging.

Fix MonitorControl#13

🔧 Fix function keys not working and retry more often when getting val…

…ues. (MonitorControl#21)

* Update `ddcctl` submodule.

* Update dependencies.

* Enable displays by default.

* Retry more often to get values from display.

* Only print when debugging.

Fix MonitorControl#13

🚀 v1.2.1

- Updated MediaKeyTap dependencies

Signed-off-by: Guillaume Broder <iamnotheoneyouseek@gmail.com>

🎉 v1.2

Many changes in commit…
- Contrast slider is back !
- Added a Preferences Window
- Function keys (should) work
- If (like me) your screen backlight is still too bright even at 0, you can now set the contrast to 0 when the brightness hit 0 too
- App can now be started at login (Needs to be tested)

Signed-off-by: Guillaume Broder <iamnotheoneyouseek@gmail.com>