1.1.2 / 2017-09-23 ==================
* perf: improve header token parsing speed
1.1.1 / 2017-03-20 ==================
* perf: hoist regular expression
1.1.0 / 2015-09-29 ==================
* Only accept valid field names in the field argument
- Ensures the resulting string is a valid HTTP header value
1.0.1 / 2015-07-08 ==================
* Fix setting empty header from empty field
* perf: enable strict mode
* perf: remove argument reassignments
1.0.0 / 2014-08-10 ==================
* Accept valid Vary header string as field
* Add vary.append for low-level string manipulation
* Move to jshttp orgainzation
0.1.0 / 2014-06-05 ==================
* Support array of fields to set
0.0.0 / 2014-06-04 ==================
* Initial release