MXNet has graduated

[sebbASF]

Description

Fix up DOAP

[mxnet-bot]

Hey @sebbASF , Thanks for submitting the PR All tests are already queued to run once. If tests fail, you can trigger one or more tests again with the following commands:

• To trigger all jobs: @mxnet-bot run ci [all]
• To trigger specific jobs: @mxnet-bot run ci [job1, job2]

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  CI supported jobs: [centos-gpu, miscellaneous, sanity, windows-cpu, edge, clang, unix-gpu, windows-gpu, centos-cpu, unix-cpu, website]

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  Note: Only following 3 categories can trigger CI :PR Author, MXNet Committer, Jenkins Admin. All CI tests must pass before the PR can be merged.

[sebbASF]

This PR does not affect the code, and should not be subject to CI builds