v2.6.0

• adds feature that split-out --topbase will add a label of the original remote branch so that after the topbase, you can see a branch of where the remote is, and compare that to where you currently are.
• adds feature for --topbase and --rebase arguments of the various split-X commands to allow an optional remote branch name. by default, if you pass in --topbase (or rebase), it will use whatever is defined in your repo file. but you can now do: --topbase some-branch and it will override whatever is in your repo file to allow to topbase (or rebase) onto a specific remote branch.
• adds a build script that will add the latest commit hash to the output of --version. This will make issue reporting a bit easier
• fixes error messages by removing panic! macro. Previously most error messages were just panic calls that resulted in debug output, which is not optimal for a command line tool. I replaced panic! with a custom die! macro which will just print and exit, so that makes the output a bit nicer