Is git rev-parse supported?

### Is git rev-parse supported?
See https://git-scm.com/docs/git-rev-parse

I see the following line 

https://github.com/ruby-git/ruby-git/blob/765df7c3d2831203863748e58c46dca0574b83db/lib/git/base.rb#L571-L580

but it's not really well documented.

And when I run an example code I get `NoMethodError`

```
irb(main):062:0> Git::Base.new.revparse('HEAD^^')
Traceback (most recent call last):
        9: from /local/workplace/aubreyya/EC2-ZIM-JlbRelayConfigUpdater/env/EC2-ZIM-JlbRelayConfigUpdater-1.0/runtime/bin/../ruby2.7.x/bin/irb:30:in `<main>'
        8: from /local/workplace/aubreyya/EC2-ZIM-JlbRelayConfigUpdater/env/EC2-ZIM-JlbRelayConfigUpdater-1.0/runtime/bin/../ruby2.7.x/bin/irb:30:in `load'
        7: from /local/workplace/aubreyya/EC2-ZIM-JlbRelayConfigUpdater/env/EC2-ZIM-JlbRelayConfigUpdater-1.0/runtime/ruby2.7.x/lib/ruby/gems/2.7.0/gems/irb-1.2.6/exe/irb:11:in `<top (required)>'
        6: from (irb):61
        5: from (irb):62:in `rescue in irb_binding'
        4: from /local/home/aubreyya/brazil-pkg-cache/packages/RubyGem-git/RubyGem-git-1.5.x.1579.0/AL2_x86_64/DEV.STD.PTHREAD/build/ruby2.7.x/lib/ruby/gems/2.7.0/gems/git-1.5.0/lib/git/base.rb:533:in `revparse'
        3: from /local/home/aubreyya/brazil-pkg-cache/packages/RubyGem-git/RubyGem-git-1.5.x.1579.0/AL2_x86_64/DEV.STD.PTHREAD/build/ruby2.7.x/lib/ruby/gems/2.7.0/gems/git-1.5.0/lib/git/base.rb:184:in `lib'
        2: from /local/home/aubreyya/brazil-pkg-cache/packages/RubyGem-git/RubyGem-git-1.5.x.1579.0/AL2_x86_64/DEV.STD.PTHREAD/build/ruby2.7.x/lib/ruby/gems/2.7.0/gems/git-1.5.0/lib/git/base.rb:184:in `new'
        1: from /local/home/aubreyya/brazil-pkg-cache/packages/RubyGem-git/RubyGem-git-1.5.x.1579.0/AL2_x86_64/DEV.STD.PTHREAD/build/ruby2.7.x/lib/ruby/gems/2.7.0/gems/git-1.5.0/lib/git/lib.rb:19:in `initialize'
NoMethodError (undefined method `path' for nil:NilClass)
```

Edit: okay I see my problem

https://github.com/ruby-git/ruby-git/blob/765df7c3d2831203863748e58c46dca0574b83db/lib/git/base.rb#L6-L8

However it would be nice to have `revparse` documented [here](https://rubydoc.info/gems/git/Git.html)

### Your environment
* `RubyGem-git = 1.5.x;`
* `git version 2.30.1 (Apple Git-130)`
* `ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.x86_64-darwin20]`

### Steps to reproduce
n/a

### Expected behaviour
n/a

### Actual behaviour
n/a

	# runs git rev-parse to convert the objectish to a full sha
	#
	# @example
	# git.revparse("HEAD^^")
	# git.revparse('v2.4^{tree}')
	# git.revparse('v2.4:/doc/index.html')
	#
	def revparse(objectish)
	self.lib.revparse(objectish)
	end

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Is git rev-parse supported? #530