Modernize .readthedocs.yml (#130)

* Drop `docs` environment, which is no longer necessary.
* Add explicit dependency to `typing_extensions` given `barril` depends on it.

.readthedocs.yml

@@ -1,10 +1,13 @@
+version: 2
 
 build:
-  image: latest
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
+sphinx:
+  configuration: docs/conf.py
 
 python:
-   version: 3.6
-   setup_py_install: true
-   pip_install: true
-   extra_requirements:
-        - docs
+  install:
+    - path: .

docs/conf.py

@@ -65,7 +65,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = "en"
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.

setup.py

@@ -7,9 +7,8 @@
 with open("CHANGELOG.rst", encoding="UTF-8") as changelog_file:
     history = changelog_file.read()
 
-requirements = ["attrs>=18.1.0", "numpy>=1.11.0", "oop-ext>=1.1"]
+requirements = ["attrs>=18.1.0", "numpy>=1.11.0", "oop-ext>=1.1", "typing_extensions"]
 extras_require = {
-    "docs": ["sphinx >= 1.4", "sphinx_rtd_theme", "sphinx-autodoc-typehints", "typing_extensions"],
     "testing": [
         "codecov",
         "data-science-types",