docs: add thanks to release notes

docs/changelog.rst

@@ -21,28 +21,28 @@ v0.2.2 (2018-07-??)
 Mitogen for Ansible
 ~~~~~~~~~~~~~~~~~~~
 
-* `#291 <https://github.com/dw/mitogen/issues/291>`_: compatibility:
-  ``ansible_*_interpreter`` variables are parsed using a restrictive shell-like
-  syntax, supporting a common idiom where ``ansible_python_interpreter`` is set
-  to ``/usr/bin/env python``.
+* `#291 <https://github.com/dw/mitogen/issues/291>`_: ``ansible_*_interpreter``
+  variables are parsed using a restrictive shell-like syntax, supporting a
+  common idiom where ``ansible_python_interpreter`` is set to ``/usr/bin/env
+  python``.
 
 * `#299 <https://github.com/dw/mitogen/issues/299>`_: fix the ``network_cli``
-  connection type when the Mitogen strategy is active. Mitogen does not help
-  connections to network devices, but it should still be possible to use such
-  connections when Mitogen is active.
+  connection type when the Mitogen strategy is active. Mitogen cannot help
+  network device connections, however it should still be possible to use device
+  connections while Mitogen is active.
 
-* `#301 <https://github.com/dw/mitogen/pull/303>`_: compatibility: the presence
-  of variables such as ``$HOME`` in the ``remote_tmp`` setting are expanded.
+* `#301 <https://github.com/dw/mitogen/pull/301>`_: variables like ``$HOME`` in
+  the ``remote_tmp`` setting are evaluated correctly.
 
 * `#303 <https://github.com/dw/mitogen/pull/303>`_: the ``doas`` become method
-  is now supported. Contributed by `Mike Walker
+  is supported. Contributed by `Mike Walker
   <https://github.com/napkindrawing>`_.
 
 * `#309 <https://github.com/dw/mitogen/issues/309>`_: fix a regression to
   process environment cleanup, caused by the change in v0.2.1 to run local
   tasks with the correct environment.
 
-* `#315 <https://github.com/dw/mitogen/pull/315>`_: the extension is now
+* `#315 <https://github.com/dw/mitogen/pull/315>`_: Mitogen for Ansible is
   supported under Ansible 2.6. Contributed by `Dan Quackenbush
   <https://github.com/danquack>`_.
 
@@ -71,6 +71,21 @@ Core Library
   escaping required.
 
 
+Thanks!
+~~~~~~~
+
+Mitogen would not be possible without the support of users. A huge thanks for
+the bug reports and pull requests in this release contributed by
+`Frances Albanese <https://github.com/falbanese>`_,
+`Mark Janssen <https://github.com/sigio>`_,
+`Ayaz Ahmed Khan <https://github.com/ayaz>`_,
+`Colin McCarthy <https://github.com/colin-mccarthy>`_,
+`Dan Quackenbush <https://github.com/danquack>`_,
+`Alex Russu <https://github.com/alexrussu>`_,
+`Josh Smift <https://github.com/jbscare>`_, and
+`Mike Walker <https://github.com/napkindrawing>`_.
+
+
 v0.2.1 (2018-07-10)
 -------------------