Update version info in preparation of v0.3 release

Signed-off-by: Ken Raffenetti <raffenet@mcs.anl.gov>

CHANGES

@@ -1,3 +1,31 @@
+===============================================================================
+                               Changes in 0.3
+===============================================================================
+
+# Default to detecting the CUDA device capabilities at configure
+  time. If no device is found on the build system, build all "major"
+  CUDA capabilities to cut down on build time and library size. (thanks
+  to Jeff Hammond for contributing)
+
+# Add support for mixed memory types (thanks to ParTec AG for
+  contributing)
+
+# Add HIP backend for stream APIs
+
+# Add automatic HIP SM detection
+
+# Add automatic CUDA SM detection
+
+# Add support for user-specified CUDA compiler
+
+# Add support in --ze-native option to compile for multiple devices
+
+# Add support for --pup-max-nesting < 2 in genpup.py
+
+# Add support for --ze-revision-id to pass to ocloc compiler
+
+# Other bug fixes and code cleanup
+
 ===============================================================================
                                Changes in 0.2
 ===============================================================================