Update with pending changes.
### SDK Enhancements
### SDK Bugs
+* `aws/client`: Fix clients polluting handler list (#1197)
+ * Fixes the clients potentially polluting the passed in handler list with the client's customizations. This change ensures every client always works with a clean copy of the request handlers and it cannot pollute the handlers back upstream.
+ * Fixes #1184
+* `aws/request`: Fix waiter error match condition (#1195)
+ * Fixes the waiters's matching overwriting the request's err, effectively ignoring the error condition. This broke waiters with the FailureWaiterState matcher state.
