Update CHANGELOG.md

Author: stmitt

CHANGELOG.md

@@ -1,7 +1,7 @@
 # Changelog for DP3T-SDK iOS
 
 ## Version 2.4.0 (30.04.2021)
-- adds methods which allows to seperatly  ask for user consent from sending the keys to the backend (DP3TTracing.requestTEKPermission and DP3TTracing.sendTEKs)
+- adds methods which allows to separately ask for user consent from sending the keys to the backend (DP3TTracing.requestTEKPermission and DP3TTracing.sendTEKs)
 - fixes retain cycle
 - fixes typo (renames permissonError to permissionError)