import geopandas
df = geopandas.read_file('test.geojson')
ax = df.plot(figsize=(10, 10), alpha=0.5, edgecolor='k')

/usr/local/lib/python3.6/dist-packages/matplotlib/backends/backend_gtk3.py:197: Warning: Source ID 8 was not found when attempting to remove it
  GLib.source_remove(self._idle_draw_id)