Update CHANGES.md for 0.0.3 (#28)

CHANGES.md

@@ -1,6 +1,13 @@
-## Unreleased
+## 0.0.3
 
-* Adds `strest-max-rps`, a tool for determining the max RPS of a backend
+* Add `strest-max-rps`, a tool for determining the max RPS of a backend.
+* [client] Add `-totalTargetRps` to throttle requests to a fixed rate.
+* [client] Rename `-concurrency` to `-connections`
+* [client] Add `-streams` to configure per-connection concurrency
+* [client] Add `-tlsTrustChainFile` to cause the client to establish and validate TLS connections.
+* [server] Add `-tlsCertFile` and `-tlsPrivKeyFile`, which causes the server to accept TLS connections.
+* [client] Do not add latency by default.
+* [client] Do not add response payloads by default.
 
 ## 0.0.2