CREDITS.txt in rufus-scheduler-2.0.17 vs CREDITS.txt in rufus-scheduler-2.0.18

@@ -2,9 +2,13 @@
 = CREDITS.txt
 
 
 == Contributors
 
+- Andrew Davey (https://github.com/asdavey) "L" in cron lines
+- Stig Kleppe-Jørgensen (https://github.com/stigkj)
+- Danny "northox" Fullerton (https://github.com/northox) negative time strings
+- Marcus Brito (https://github.com/pazustep) CronLine proofing
 - André Luis Leal Cardoso Junior (https://github.com/andrehjr) 1.9.3 patch
 - Anthony Lewis (https://github.com/anthonylewis) cron lines and 09 issue
 - concept47 (https://github.com/concept47) every and :discard_past
 - Chris Kampemeier (http://github.com/chrisk) rspec 2.0 refinements
 - Tanzeeb Khalili (http://github.com/tanzeeb) cron and timezones