Improve changelog

Author: alex-kulakov

ChangeLog/6.0.7_dev.txt

@@ -1,3 +1,4 @@
 [main] Fixed issue of actual NULL constant being treated as a caching value
 [main] Fixed rare case of infinite loop on batching commands
-[main] Improved VS compatibility by not processing design-time builds
+[main] Improved VS compatibility by not processing design-time builds
+[main] Introduced IDbConnectionAccessor that gives access to certain stages of connection opening