Regex flag fix

[NicoZelaya]

What: Changing constant regex creation.

Why: This causes issues on some versions of Node. Currently there are two issues opened for this.

How: Instead of using RegEx constructor, use RegEx literal. As the regex is constant there is no need to use the constructor.

Checklist:

• Documentation "N/A"
• Tests "N/A" (No need for update, but I've executed the test suite)
• Ready to be merged
• Added myself to contributors table

This is causing issues for us as well. It's just a small change that will increase compatibility.
Current issues that should be fixed with this:
#159
#160

Any feedback is really appreciated!

[codecov]

Codecov Report

Merging #161 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #161   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           3      3           
  Lines          63     63           
  Branches       14     14           
=====================================
  Hits           63     63

Impacted Files	Coverage Δ
src/index.js	100% <100%> (ø)	⬆️

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[kentcdodds]

Thank you!

[NicoZelaya]

You're welcome! It's a pleasure to be able to contribute.