#126 - vacation request reminders (#130)

* #126 - vacation request reminders

* #126 - fix workdays

* #126 - changes

* #126 - cs fix

* #5 - bump codestyle

* #126 - fix

* #126 - fix

* #126 - fix

* #126 - fix

* #126 - tests

* #126 - fix

* #126 - fix

* #126 - fix seeders

* #126 - fix

* #126 - tests

Co-authored-by: EwelinaLasowy <ewelina.lasowy@blumilk.pl>

.env.example

@@ -60,3 +60,8 @@ GOOGLE_CLIENT_SECRET=
 GOOGLE_REDIRECT=http://localhost/login/google/end
 GOOGLE_CALENDAR_ID=
 LOCAL_EMAIL_FOR_LOGIN_VIA_GOOGLE=
+
+SLACK_URL=https://slack.com/api
+SLACK_CLIENT_TOKEN=
+SLACK_SIGNING_SECRET=
+SLACK_DEFAULT_CHANNEL="#general"