Fix lint (#55)

Author: blakeembrey

index.js

@@ -20,7 +20,7 @@
  * obs-text      = %x80-FF
  * quoted-pair   = "\" ( HTAB / SP / VCHAR / obs-text )
  */
-var PARAM_REGEXP = /;[\t ]*([!#$%&'*+.^_`|~0-9A-Za-z-]+)[\t ]*=[\t ]*("(?:[\u000b\u0020\u0021\u0023-\u005b\u005d-\u007e\u0080-\u00ff]|\\[\u000b\u0020-\u00ff])*"|[!#$%&'*+.^_`|~0-9A-Za-z-]+)[\t ]*/g
+var PARAM_REGEXP = /;[\t ]*([!#$%&'*+.^_`|~0-9A-Za-z-]+)[\t ]*=[\t ]*("(?:[\u000b\u0020\u0021\u0023-\u005b\u005d-\u007e\u0080-\u00ff]|\\[\u000b\u0020-\u00ff])*"|[!#$%&'*+.^_`|~0-9A-Za-z-]+)[\t ]*/g // eslint-disable-line no-control-regex
 
 var TEXT_REGEXP = /^[\u000b\u0020-\u007e\u0080-\u00ff]+$/ // eslint-disable-line no-control-regex
 var TOKEN_REGEXP = /^[!#$%&'*+.^_`|~0-9A-Za-z-]+$/