Format version changelogs

Here we describe the various versions of Guppy XML documents and symbol specifications that may exist in the wild with the following caveats:

Symbol

The complete specification for the current version is described in the documentation for Guppy.add_global_symbol.

2.0.0-alpha.3

2.0.0-alpha.2

2.0.0-alpha.1

1.0.0

Initial version

Document

The complete specification for the current version is described in the XML format page.

1.2.0

1.1.0

1.0.0

Initial version