load_earth_relief no longer need the convert_bools=False hack

Author: seisman

pygmt/datasets/earth_relief.py

@@ -10,7 +10,7 @@
 from pygmt.src import grdcut, which
 
 
-@kwargs_to_strings(convert_bools=False, region="sequence")
+@kwargs_to_strings(region="sequence")
 def load_earth_relief(resolution="01d", region=None, registration=None, use_srtm=False):
     r"""
     Load Earth relief grids (topography and bathymetry) in various resolutions.