Fermipy

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* Requirements of astropy and gammapy updated

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* Added `tutorial notebooks <https://fermipy.readthedocs.io/en/master/tutorials.html>`_ to the documentation
* Published `organization chart <https://fermipy.readthedocs.io/en/master/team.html>`_
* Added PS map implementing code from Philippe Bruel in `~fermipy.gtanalysis.GTAnalysis.psmap`
* Added PS map visualition in `~fermipy.gtanalysis.plotter.make_psmap_plots`
* Added `PS map <https://fermipy.readthedocs.io/en/master/advanced/psmap.html>`_ to the documentation

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* fix the dependence of scipy due to gammapy

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* Small bug fixes.
* pinned astropy<6

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* Small bug fixes.
* No more glaring issues remain open.

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* Allow user-defined energy bins for energy-dependent extension fit.
* Make sure the last time bin in the light curve ends at ``tmax``.