__init__.py: Remove unused constant

Metadata API defines a specification version it supports already,
and that one is updated to the actual specification version we
produce.

Signed-off-by: Jussi Kukkonen <jkukkonen@vmware.com>

Author: Jussi Kukkonen

tuf/__init__.py

@@ -9,11 +9,3 @@
 # Currently, when the version is changed, it must be set in both locations.
 # TODO: Single-source the version number.
 __version__ = "0.20.0"
-
-# This reference implementation produces metadata intended to conform to
-# version 1.0.0 of the TUF specification, and is expected to consume metadata
-# conforming to version 1.0.0 of the TUF specification.
-# All downloaded metadata must be equal to our supported major version of 1.
-# For example, "1.4.3" and "1.0.0" are supported.  "2.0.0" is not supported.
-# See https://github.com/theupdateframework/specification
-SPECIFICATION_VERSION = "1.0.0"