remore depreciated makeMappingArray (#22)

setup.py

@@ -19,7 +19,7 @@
 setup(
     name="stylecloud",
     packages=["stylecloud"],  # this must be the same as the name above
-    version="0.5.1",
+    version="0.5.2",
     description="Python package + CLI to generate stylistic wordclouds, "
     "including gradients and icon shapes!",
     long_description=long_description,
@@ -33,7 +33,7 @@
     entry_points={
         "console_scripts": ["stylecloud=stylecloud.stylecloud:stylecloud_cli"],
     },
-    python_requires=">=3.5",
+    python_requires=">=3.6",
     include_package_data=True,
     install_requires=[
         "wordcloud",

stylecloud/stylecloud.py

@@ -3,7 +3,7 @@
 import csv
 import os
 from PIL import Image
-from matplotlib.colors import makeMappingArray, to_rgb
+from matplotlib.colors import to_rgb
 import numpy as np
 import fire
 from shutil import rmtree
@@ -132,7 +132,7 @@ def gen_gradient_mask(
     mask_array = np.float32(mask_array)
 
     palette_func = gen_palette(palette)
-    gradient = np.array(makeMappingArray(size, palette_func.mpl_colormap))
+    gradient = palette_func.mpl_colormap(np.linspace(0.0, 1.0, size))
 
     # matplotlib color maps are from range of (0, 1). Convert to RGB.
     gradient *= 255.0