Release notes

This minor release contains a couple of enhancements and fixes since v0.3.1:

Added fancy diff display format (based on diff-so-fancy) which is now the default. The diff format can be configured using the new diff-display config variable.
Set shell command working directory to be the root of the repository.
Fix bug causing mouse to be disabled when GRV is restored after being backgrounded.
Shell commands invoked with ! are run in the controlling terminal.
Escape or <C-c> cancels the prompt.
Added input-prompt-after-command config variable to configure whether the "Press any key to continue" message is displayed after executing an external command.
Added diff-view-file GRV variable which contains the currently selected file in the active DiffView.
Defaulted commit-limit variable to 100,000.
A search term can be provided as an argument to the help command.
Added sleep command which causes GRV to sleep for the provided number of seconds.
Removed built in cold theme.

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