Internal: Introduced reporting to Slack from Travis.

.travis.yml

@@ -12,6 +12,7 @@ branches:
   except:
   - stable
 before_install:
+- export START_TIME=$( date +%s )
 - export DISPLAY=:99.0
 - sh -e /etc/init.d/xvfb start
 - npm i -g yarn
@@ -22,7 +23,11 @@ script:
 - ckeditor5-dev-tests-travis
 after_success:
 - ckeditor5-dev-tests-save-revision
+after_script:
+- export END_TIME=$( date +%s )
+- ckeditor5-dev-tests-notify-travis-status
 env:
   global:
   - secure: CSFKXnTb2oQW8YIjh+SWXYSYzx1jcIg1wGcl6jWrbaOU06JHEO77YLKlhMxLfRniFtilBEksK4ugIcn+lihykhHleMxI27+kifILdLLZKvwWlZiDrtpJSzLk08SpRNDwwthSlHVKrxbHVFE1K9SYpX4s3qTpxullDMPgc13OP4c=
   - secure: WGdwDEavTOIE/yw8pdpWmx3Cehm2/GN8gZMimuot8sWPbOZRuPh+2lnVWpASLe25qJUKKeLWYLRHccpMLKbyweiordSEBwzNrOGOFyUuaDPITNZZrp5ekh2vHBp1+mwhRpRekdyWdzzVsm01RkFrnJqQlaXxX9i/r9Tu4EsK54M=
+  - secure: BKoFnOWcfKn8zaTvilMn9UORF+gR1zBqetqai5FKfSKraJXqiBrz1AI3ecytCjJOKS1g6HoRtZHwVS4a+uG3JjK3bRERQF2NyHiyjbrsL+2HaKaRnVmox8PC/59m1PJlcRKAV9RTYJqL/oqa7N8OBegt4LpIVnEcil8WCErCF6Q=