add release authors details

Should we include this release info somewhere?

```
% scripts/authors.scala forked-from-akka v1.0.0
warning: exhaustive rename detection was skipped due to too many files.
warning: you may want to set your diff.renameLimit variable to at least 3469 and retry the command.
Couldn't parse summary section for Stats(PJ Fanning,pjfanning@users.noreply.github.com,31,3830,3901,3313) 'stray space in doc (#372)'
Couldn't parse summary section for Stats(Johannes Rudolph,johannes.rudolph@gmail.com,18,2834,3818,62) 'build: fix syntax of publish.yml to avoid noisy errors in forks (#45)'
commits added removed
123 9766 12556 PJ Fanning
93 761650 756738 Matthew de Detrich
18 2834 3818 Johannes Rudolph
9 28119 74 He-Pin
4 9 8 Arnout Engelen
3 243 50 Sean Glover
3 9 11 kerr
2 4484 4498 Greg Methvin
2 1517 2883 Jonas Chapuis
2 41 22 Sam Byng
2 8 19 Denny Yung-Yu Chen
1 1763 1565 Auto Format
1 595 73 Iain Hull
1 150 150 Seeta Ramayya
1 74 99 Samik Raychaudhuri
1 9 21 Samuele Resca
1 10 10 哇呜哇呜呀咦耶
1 6 6 Edward Samson
1 4 4 Keith Wansbrough
1 4 4 sangbong
1 1 1 Zachary Sistrunk
1 1 1 Philippus Baalman
1 1 1 sdeigm
% scripts/authors.scala v1.0.0 v1.0.1
commits added removed
14 204 171 PJ Fanning
12 238 54 Matthew de Detrich
1 18 0 Naoki Yamada
1 1 1 He-Pin
```