Fix the RegEx used to identify t.co

[aawc]

Escaping the '.' in t.co

[tony-o]

@aawc that isn't regex, it's just searching for a string :-)

[timdorr]

String.prototype.match() either takes a RegExp or implicitly converts the argument to a RegExp: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/match

Before my PR landed, this was being treated as a regular expression. @aawc was correct.

[tony-o]

I stand corrected. Thank you @aawc and @timdorr