Add ECMAScript comment to JSMin.cs/NextCharExcludingComments() #177
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ECMAScript states that <!--SingleLineCommentChars--> is also the comment style.
Please refer to https://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf page 773.
I just add this pattern to JSMin.cs/NextCharExcludingComments() to avoid exception.