sse2: add Hasindu Gamaarachchi and Jeff Daily copyrights to header
* 2015-2017 John W. Ratcliff <jratcliffscarab@gmail.com>
* 2015 Brandon Rowlett <browlett@nvidia.com>
* 2015 Ken Fast <kfast@gdeb.com>
+ * 2017 Hasindu Gamaarachchi <hasindu@unsw.edu.au>
+ * 2018 Jeff Daily <jeff.daily@amd.com>
*/
#if !defined(SIMDE__SSE2_H)
