Tweak CHANGELOG a little bit. (#242)

Mention cloning Agent, default timeout, and removal of Request::build.

CHANGELOG.md

@@ -8,20 +8,30 @@
  * Move more configuration to Agent. Timeouts, TLS config, and proxy config
    now require building an Agent.
  * Create AgentBuilder to separate the process of building an agent from using
-   the resulting agent.
- * Rewrite README and top-level documentation.
+   the resulting agent. Headers can be set on an AgentBuilder, not the
+   resulting Agent.
+ * Agent is cheaply cloneable with an internal Arc. This makes it easy to
+   share a single agent throughout your program.
+ * There is now a default timeout_connect of 30 seconds. Read and write
+   timeouts continue to be unset by default.
  * Add ureq::request_url and Agent::request_url, to send requests with
    already-parsed URLs.
  * Remove native_tls support.
  * Remove convenience methods `options(url)`, `trace(url)`, and `patch(url)`.
    To send requests with those verbs use `request(method, url)`.
+ * Remove Request::build. This was a workaround because some of Request's
+   methods took `&mut self` instead of `mut self`, and is no longer needed.
+   You can simply delete any calls to `Request::build`.
  * Remove Agent::set_cookie.
  * Remove Header from the public API. The type wasn't used by any public
    methods.
+ * Remove basic auth support. The API was incomplete. We may add back something
+   better in the future.
  * Remove into_json_deserialize. Now into_json handles both serde_json::Value
    and other types that implement serde::Deserialize. If you were using
    serde_json before, you will probably have to explicitly annotate a type,
    like: `let v: serde_json::Value = response.into_json();`.
+ * Rewrite README and top-level documentation.
 
 # 1.5.2