New features

• Expand ~ in the gitsh.historyFile setting (Cedric Staniewski)
• Support %g and %G in the prompt format to show the current Git command (Ben Knoble)
• Complete tab completion rewrite, replacing naive options with a context-aware system (George Brocklehurst & Eric Collins)
  • Tab complete the names of gitsh and git-config variables
  • Tab complete command options (e.g. push --force-<tab> expands to push --force-with-lease)
  • Tab complete more than one command on the same line (e.g. commit && pus --force-<tab>)
  • Define custom tab completion options for aliases and custom commands in a ~/.gitsh_completions file
• Tab completion of commands is now compatible with Git 2.20 (George Brocklehurst)

Internals

• Fix various Ruby warnings, and set up tools to prevent us introducing more (Teo Ljungberg)