Release 2.0.3

Changes since 2.0.2:
- Fixed a bug in the command line argument parser that resulted in error
  messages like
    Error: Error 4 while parsing argument 5
    Error: Invalid argument for option --system=: false

.version

@@ -1,3 +1,3 @@
 major_version=2
 minor_version=0
-patch_version=2
+patch_version=3