Avoid using the ambiguous \h shorthand character

[pchaigno]

Description of the Change

Depending on the regular expression engine used, \h does not always
mean the same. With a PCRE engine, it matches white spaces, whereas,
with a Oniguruma engine, it matches hexademical digit characters.
Atom uses an Oniguruma engine, but github.com relies on a PCRE
engine.

Alternate Designs

None were considered.

Benefits

Makes the grammar PCRE-compatible, so that it can be used on github.com.

Possible Drawbacks

I don't have any way to check these PCRE vs. Oniguruma discrepancies at the moment. I'm working on a new test at the Linguist-level to check for all known discrepancies.

[Alhadis]

HAHAHA, what the hell, I've been contributing to this grammar for ages and never once picked up on this.

I feel bad. :(

[pchaigno]

😝

[Alhadis]

I pulled your branch to run the package's spec-suite for you... Everything turned up aOK(😂👌);