Negative percentage values still flagged by shorthand-values

[attila]

This could be related to #429 but

.foo {
  margin: -10% -20%;
}

is flagged by "shorthand-values" in latest develop.

Command output:

$ ./$ node_modules/.bin/sass-lint -v test.scss

test.scss
  2:11  warning  Property `margin` should be written more concisely as `-` instead of `- -`  shorthand-values

✖ 1 problem (0 errors, 1 warning)

[DanPurdy]

Confirmed, looks like something to do with percentage values and their structure in gonzales. Will look into it, thanks @attila .

[DanPurdy]

sorted in #441 will be part of the 1.4.0 release scheduled for this week