document release contributors

[pjfanning]

 % ~/code/incubator-pekko/scripts/authors.scala forked-from-akka v1.0.0-RC2
warning: exhaustive rename detection was skipped due to too many files.
warning: you may want to set your diff.renameLimit variable to at least 1222 and retry the command.
Couldn't parse summary section for Stats(Matthew de Detrich,matthew.dedetrich@*****.io,4,5,5,3) 'Fix new sources so that they use the Apache standard header'
commits  added  removed
     86   6002     5157 Johannes Rudolph
     85   3448     7588 PJ Fanning
     67 129873   117890 Matthew de Detrich
      4    226      181 Jan Chyb
      4    173      153 Arnout Engelen
      2  13644    10541 Auto Format
      1     66     6957 Łukasz Sowa
      1    119     1389 hughsimpson
      1     60       12 Lomig Mégard
      1     12       10 Mathias
      1      6        0 Jean-Luc Deprez
      1      2        1 krrrr38
      1      2        0 Keith Wansbrough
      1      1        1 kerr
      1      1        0 Oliver Trosien