Fix "Apache License, Version 2.0" spelling #137
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There are many Java libraries licensed under "Apache License, Version 2.0" that do not use its official spelling.
This causes issues like https://issues.apache.org/jira/browse/MPIR-382: with every library defining its own spelling, it's difficult in large projects to have a clear view of all licenses in use.
This PR changes the license spelling to the official one, as advised by Maven developers.