Merge pull request #53 from Lnaden/docs063

Update change log for 0.6.3

docs/source/changelog.rst

@@ -13,6 +13,30 @@ Changelog
 .. Bug Fixes
 .. +++++++++
 
+v0.6.3 / 2019-03-15
+-------------------
+
+New Features
+++++++++++++
+
+- (:pr:`28`) TeraChem is now a registered executor in Engine! Thanks to @ffangliu for implementing.
+- (:pr:`46`) MP2D is now a registered executor in Engine! Thanks to @loriab for implementing.
+
+Enhancements
+++++++++++++
+
+- (:pr:`46`) ``dftd3``'s workings received an overhaul. The ``mol`` keyword has been replaced with ``dtype=2``,
+  full Psi4 support is now provided, and an MP2D interface has been added.
+
+Bug Fixes
++++++++++
+- (:pr:`50` and :pr:`51`) Executing Psi4 on a single node with multiprocessing is more stable because Psi4 temps are
+  moved to scratch directories. This behavior is now better documented with an example as well.
+- (:pr:`52`) Psi4 calls are now executed through the ``subprocess`` module to prevent possible multiprocessing issues
+  and memory leak after thousands of runs. A trade off is this adds about 0.5 seconds to task start-up, but its safe.
+  A future Psi4 release will correct this issue and the change can be reverted.
+
+
 v0.6.2 / 2019-03-07
 -------------------