v2.0.0

This is a full rewrite of sesh, it's finally here!

Here are some notable changes:

1. I'm now using a dependency injection pattern, so every area of the application can be tested
2. I'm using Mockery for automated mocking
3. The connect logic got simplified and restructured. There are now "strategies" that are more concise and clear, making sesh's connect behavior more predictable

Breaking changes:

1. startup_script is now dropped. I recommend you make your script files executable then change any startup_script configurations to startup_command

Thank you all for the patience and support while I work through this rewrite. I'm excited to bring new features to sesh next so stay tuned in! I stream Thursday nights (CDT) so come join me while I continue to build sesh.