scikit-hep/scikit-hep: Version 2.0.0

Major update of dependencies with, in particular, a move to iminuit 2.x: awkward~=1.1.0 awkward0~=0.15 boost-histogram~=0.13.0 decaylanguage~=0.10.0 hepstats~=0.3.0 hepunits~=2.1.0 hist~=2.1.0 histoprint~=1.6.0 iminuit~=2.4.0 matplotlib>2.0.0 mplhep~=0.2.0 numpy>=1.13.1 particle~=0.14.0 uproot~=4.0.0 uproot3~=3.14.0 uproot3-methods~=0.10.