Deprecation warning on Julia 1.7 beta

[j-fu]

Hi,

when using PyPlot on 1.7 beta I see the following deprecation warning:

┌ Warning: `vendor()` is deprecated, use `BLAS.get_config()` and inspect the output instead
│   caller = npyinitialize() at numpy.jl:67
└ @ PyCall ~/.julia/packages/PyCall/BD546/src/numpy.jl:67

[colbec]

Please see https://github.com/JuliaPy/PyCall.jl/pull/910/commits/42809802d5c78775fd32d51c5e128e10113a51ea where I think I have completed my part but open to further suggestions.