Fix Union formatting

Author: minimaxir

setup.py

@@ -19,7 +19,7 @@
 setup(
     name="stylecloud",
     packages=["stylecloud"],  # this must be the same as the name above
-    version="0.5.0",
+    version="0.5.1",
     description="Python package + CLI to generate stylistic wordclouds, "
     "including gradients and icon shapes!",
     long_description=long_description,

stylecloud/stylecloud.py

@@ -169,12 +169,12 @@ def gen_stylecloud(
     size: int = 512,
     icon_name: str = "fas fa-flag",
     palette: str = "cartocolors.qualitative.Bold_5",
-    colors: Union(str, List[str]) = None,
+    colors: Union[str, List[str]] = None,
     background_color: str = "white",
     max_font_size: int = 200,
     max_words: int = 2000,
     stopwords: bool = True,
-    custom_stopwords: Union(List[str], set) = STOPWORDS,
+    custom_stopwords: Union[List[str], set] = STOPWORDS,
     add_stopwords: bool = False,
     icon_dir: str = ".temp",
     output_name: str = "stylecloud.png",