Tag pyjet as deprecated (#150)
Tag pyjet as deprecated (#150)

Related to https://github.com/scikit-hep/pyjet/pull/56.
scikit-hep/scikit-hep.github.io,scikit-hep/scikit-hep.github.io,scikit-hep/scikit-hep.github.io,scikit-hep/scikit-hep.github.io