Add readthedocs config file to force newer dependencies

.readthedocs.yml

@@ -0,0 +1,13 @@
+version: 2
+
+build:
+  os: "ubuntu-20.04"
+  tools:
+    python: "3.10"
+sphinx:
+  configuration: doc/conf.py
+python:
+  install:
+    - requirements: rtd_requirements.txt
+    - method: pip
+      path: .

doc/conf.py

@@ -121,7 +121,7 @@ def __getattr__(cls, name):
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'default'
+html_theme = 'sphinx_rtd_theme'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the

rtd_requirements.txt

@@ -3,3 +3,6 @@ rasterio
 xarray
 dask[array]
 docutils<0.18
+sphinx>=5,<6
+sphinx-rtd-theme>=1.1.0,<2.0
+

setup.cfg

@@ -7,6 +7,8 @@ universal=1
 
 [flake8]
 max-line-length = 120
+exclude = 
+    doc/conf.py
 
 [versioneer]
 VCS = git