Corrected short identifier for license

[rrehbein]

Issue #, if available:

Description of changes:

The license text appears to be Apache License 2.0. The short identifier used does not appear to be defined, but nearly correct for the license.

See: https://getcomposer.org/doc/04-schema.md#license

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.