Add support for ReadTheDocs (#1328)

* Add .readthedocs.yml

.readthedocs.yml

@@ -0,0 +1,23 @@
+# .readthedocs.yml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: docs/conf.py
+
+# Build documentation with MkDocs
+#mkdocs:
+#  configuration: mkdocs.yml
+
+# Optionally set the version of Python and requirements required to build your docs
+python:
+  version: 3.7
+  install:
+      - method: pip
+        path: .
+        extra_requirements:
+           - doc

setup.py

@@ -88,9 +88,7 @@ optional_reqs = [
 
 doc_reqs = [
     "pygame>=1.9.3,<2.0; python_version<'3.8'",
-    "numpydoc>=0.6.0,<1.0",
-    "sphinx_rtd_theme>=0.1.10b0,<1.0",
-    "Sphinx>=1.5.2,<2.0",
+    "numpydoc<2.0",
 ]
 
 test_reqs = [