v1.0.0

PythonPlot v1.0.0

Closed issues:

• downgraded to PythonCall 0.5.1 (#1)
• 3D plots/subplots (#4)
• contour with (x,y) being ranges (#8)
• arrowprops and Dict() (#9)

Merged pull requests:

• modernize API somewhat (#2) (@stevengj)
• PythonCall seems to require Julia 1.6+ (#3) (@stevengj)
• fix 3d axis overwriting (#5) (@stevengj)
• use pyhasattr instead of hasproperty (#6) (@stevengj)
• Update Project.toml (#10) (@jd-foster)