Finalize CHANGELOG for 0.2.0 release

Author: psalz

CHANGELOG.md

@@ -6,18 +6,26 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic
 Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [0.2.0]
+## [0.2.0] - 2020-09-04
 
-### Changed
+### Added
 
-- Celerity now uses (and requires) C++17.
 - Following the release of the SYCL 2020 provisional spec, master access tasks
   have been retired in favor of host tasks. These are scheduled in command groups
   in the same fashion as compute tasks. In addition to master-only execution,
-  they allow distributing host code amongst nodes.
+  they allow distributing host code amongst nodes. (bbf90637)
+- Celerity buffers are now fully virtualized, meaning that your Celerity
+  application only allocates as much memory as required on each node.
+  (8a203872)
 - _(Experimental)_ Collective host tasks allow integration of distributed I/O
   by providing an infrastructure to call MPI collective APIs like parallel
-  HDF5 from within asynchronous Celerity tasks.
+  HDF5 from within asynchronous Celerity tasks. (bbf90637)
+- Properly support 3D kernels. (e5543bd0)
+
+### Changed
+
+- Celerity now uses (and requires) C++17. (5eec3e02)
+- Celerity should now perform better with large command graphs. (5d876a5a)
 - Celerity should now be able to automatically assign a unique compute device
   to each node on a host, given that a sufficient number of devices is
   available. (9d3da06e)
@@ -27,7 +35,11 @@ Versioning](http://semver.org/spec/v2.0.0.html).
 - Don't print an error message regarding buffer lifetime for trivial programs
   (i.e., programs containing no tasks). (ae133458)
 
+### Removed
+
+- Removed `celerity::queue::with_master_access`, which is replaced by the
+  more powerful `celerity::handler::host_task`. (bbf90637)
+
 ## [0.1.0] - 2019-09-05
 
 __Hello, World!__ This is our first release!
-