PKE-v2.1.0

Release notes:
Added scrollbar to output
Combined input to single window
Changed output to pop up dialog box
Added custom encryption keys

PKE-v2.0.0

Release notes:

• Enhanced encryption
• Added documentation
• Added support for special characters
• Added support for capital letter
• Changed prompts

PKE-v1.2.1

Release notes:
- Fixed decryption button bug

PKE-v1.2.0

Release notes:
- Loops back to welcome screen

PKE-v1.1.1

Release notes:
- Enlarged output text boxes

PKE-v1.1.0

Release notes:
- added copy-paste functionality