TUN-4855: Added CHANGES.md for release 2021.8.0

Author: sudarshan-reddy

CHANGES.md

@@ -1,5 +1,12 @@
 **Experimental**: This is a new format for release notes. The format and availability is subject to change.
 
+## 2021.8.0
+### Bug fixes
+- Prevents tunnel from accidentally running when only proxy-dns should run. 
+
+### Improvements
+- If auto protocol transport lookup fails, we now default to a transport instead of not connecting.
+
 ## 2021.6.0
 ### Bug Fixes
 - Fixes a http2 transport (the new default for Named Tunnels) to work with unix socket origins.

RELEASE_NOTES

@@ -1,7 +1,7 @@
 2021.8.0
 - 2021-07-30 TUN-4847: Allow to list tunnels by prefix name or exclusion prefix name
 - 2021-07-30 TUN-4772: Release built executables with packages
-- 2021-07-30 TUN-4851: Component tests to sanity check that Proxy DNS and Tunnel are only run when expected
+- 2021-07-30 TUN-4851: Component tests to smoke test that Proxy DNS and Tunnel are only run when expected
 - 2021-07-28 TUN-4811: Publish quick tunnels' hostname in /metrics under `userHostname` for backwards-compatibility
 - 2021-07-29 TUN-4832: Prevent tunnel from running accidentally when only proxy-dns should run
 - 2021-07-28 TUN-4819: Tolerate protocol TXT record lookup failing