message: Update contributors.txt
  add real mails
diff: Anzt Hartwig <hartwig.anzt@kit.edu> Karlsruhe Institute of Technology
  -Boman Erik <nomail@mail.edu> Sandia National Laboratories
  +Boman Erik <egboman@sandia.gov> Sandia National Laboratories
  Chen Yenchen <yanjen224@gmail.com> National Taiwan University
  Cojean Terry <terry.cojean@kit.edu> Karlsruhe Institute of Technology
  Drzaic Jelena <jelena.drzaic1@gmail.com>
  Flegar Goran <flegar@uji.es> Universitat Jaume I
  -Heroux Mike <nomail@mail.edu> Sandia National Laboratories
  -Hoemmen Mark <nomail@mail.edu> Sandia National Laboratories
  +Heroux Mike <maherou@sandia.gov> Sandia National Laboratories
  +Hoemmen Mark <mhoemme@sandia.gov> Sandia National Laboratories
  Nayak Pratik <pratik.nayak@kit.edu> Karlsruhe Institute of Technology
  Tsai Yuhsiang <yhmtsai@gmail.com> National Taiwan University
  