add [history] spec

[programmer4229]

fixes issue #2039

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[withfig-bot]

Overview

src/history.ts:

Info:

[withfig-bot]

Hello @programmer4229,
thank you very much for creating a Pull Request!
Here is a small checklist to get this PR merged as quickly as possible:

• Do all subcommands / options which take arguments include the args property (args: {})?
• Are all options modular? E.g. -a -u -x instead of -aux
• Have all other checks passed?

Please add a 👍 as a reaction to this comment to show that you read this.

[grant0417]

Hey @programmer4229 can you sign the CLA?

[mschrage]

These should not be subcommands. 0 is an argument. (You can pass a number of history items you wish to show.)

The pipe and "grep" should be removed entirely since these are not syntax of the history command, but other shell constructs and commands.