Add release dates in Changelog

CHANGELOG.md

@@ -1,12 +1,12 @@
 # Changelog for kea-hook-runscript
 
-## 1.1.0
+## 1.1.0 (2017-10-22)
 
 - Add lots of DHCPv6 variables: DHCPv6 should now be usable
 - Add some more DHCPv4 variables, especially for leases
 - Safety fixes: fix potential NULL pointer dereference, and unsafe string usage
 - Makefile: use standard CXX variable instead of hard-coding g++
 
-## 1.0.0
+## 1.0.0 (2017-08-24)
 
 - Initial release