Point fixes for CleverDict 1.8.1 compatibility

Also minor fix to prevent LICENSE text appending to itself.

Closes #42

Version 2.0.5

Minor bug fixes.

Version 2.0.1

PEP440 version numbering!
Greatly improved single window design!
New helpful features via handy MenuButtons!

Version 1.18

NEW

• Utility function .summary() to show which values have not yet been set.

MODIFIED

• Numerous bug fixes, mainly to do with kwargs handling, credentials handling, and saving/loading without overwriting.
• Numerous style improvements thanks to Felix
• Numerous refactoring suggestions thanks to Felix
• keyword prompts=False now used to return Package object early without going through all the GUI prompts. This should finally make it possible to add meaningful tests without having to simulate user input e.g. with Selenium.
• Felix's suggestions for using JSON with licenses (not fully tested yet. In future please submit tests alongside actual code, thanks!)