Properjpg

**BREAKING CHANGES**
The app's default behavior is now different. App will automatically save images as progressive jpeg, and the default compressor quality will be set to 85 instead of 75.

Features:

- Added `-v` tag to check the version of the app

Changes:

- Added "progressive jpg" mode.
- Decoupled "optimize" from "quality".

Release notes:

- Added "reduce" functionality.
- Improved readme file.

Client:

- Replaced some if blocks with try blocks.

Dev:

- 100% test coverage
- Improved tests
- Improved typing
- Improved description in functions

ProperJPG

This is the first alpha release of ProperJPG.

See 'README' for instructions on how to install and use it =).