NCAR/geocat-viz: v2020.7.30.1

Release Notes: Updated functionality: add_major_minor_ticks (https://github.com/NCAR/geocat-viz/pull/12) Added functionality: set_vector_density (https://github.com/NCAR/geocat-viz/pull/10) set_map_boundary (https://github.com/NCAR/geocat-viz/pull/11) plotCLabels (https://github.com/NCAR/geocat-viz/pull/16) plotELabels (https://github.com/NCAR/geocat-viz/pull/16) findLocalExtrema (https://github.com/NCAR/geocat-viz/pull/17) Removed functions (which were previously deprecated): nclize_axis make_byr_cma