Prepare release 1.6.0-M2 (#356)

Author: jadamcrain

CHANGELOG.md

@@ -1,9 +1,10 @@
 
-### 1.6.0-M1 ###
+### 1.6.0-M2 ###
 * :star: Add master station support for writing files to the outstation. See [#338](https://github.com/stepfunc/dnp3/pull/338).
 * :star: Add master station support for command events (groups 13 and 43). See [#332](https://github.com/stepfunc/dnp3/pull/332).
 * :star: Add master station support for group 102. See [#335](https://github.com/stepfunc/dnp3/pull/335).
-* :star: See TCP port from server in Rust API. [#335](https://github.com/stepfunc/dnp3/pull/331).
+* :star: Add master and outstation support for UDP. See [#353](https://github.com/stepfunc/dnp3/pull/353).
+* :star: Obtain TCP port from server in Rust API. [#331](https://github.com/stepfunc/dnp3/pull/331).
 
 ### 1.5.2 ###
 * :bug: Fix bug where the outstation would sleep before all unsolicited data was transmitted. See [#341](https://github.com/stepfunc/dnp3/pull/341).