Update version number

CHANGELOG.md

 # Change Log
 
+## Version 1.2.5 - 2021-04-30
+
+- Added logo !
+- Added check for inscription to multiple instances of same activity
+- Fixed planning bugs
+- Added missing columns to some CSV exports
+- Added optionnal nullable field to change a slot's duration
+
 ## Version 1.2.4 - 2021-04-28
 
 - Custom title to error pages

site_settings/constants.py

 # The website version number
-WEBSITE_VERSION = "1.2.4"
-WEBSITE_VERSION_DATE = "2021-04-28"
+WEBSITE_VERSION = "1.2.5"
+WEBSITE_VERSION_DATE = "2021-04-30"
 
 WEBSITE_FULL_VERSION = "{} - {}".format(
 	WEBSITE_VERSION, WEBSITE_VERSION_DATE