Fix@tinacms/apigit`/show/:path`endpoint

Possible fix for several reports

There are three pieces to this bug.

First, on windows path's can contain forward slashes, ordouble back slashes. For example

1data/author.json

or

1data\\author.json

Second, Node's

returns the second on Windows.

Third, the

command behaves oddly with the former:

1git show HEAD:data/author.json

Returns the contents of the file

1git show HEAD:data/dne.json

Throws an error, and finally

1git show HEAD:data\\author.json

returns an empty string.

This very well may be a bug in Git. I'm not sure.

该提问来源于开源项目：tinacms/tinacms

I wonder if there's an ESLint option for that?