Fix readthedocs errors

* Don't build pdfs in readthedocs

* Update .readthedocs.yml

* Update ci.yml

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
     - name: Run pydocstyle
       run: pydocstyle asyncpraw
     - name: Run sphinx
-      run: sphinx-build -W --keep-going docs/ /tmp/foo
+      run: sphinx-build --keep-going docs/ /tmp/foo
     strategy:
       matrix:
         os: [macOS-latest, ubuntu-latest, windows-latest]
@@ -73,7 +73,7 @@ jobs:
     - name: Run pydocstyle
       run: pydocstyle asyncpraw
     - name: Run sphinx
-      run: sphinx-build -W --keep-going docs/ /tmp/foo
+      run: sphinx-build --keep-going docs/ /tmp/foo
     strategy:
       matrix:
         python-version: [3.6, 3.7, 3.8]

.readthedocs.yml

@@ -1,17 +1,10 @@
-version: 2
-
 formats:
   - htmlzip
-  - pdf
-
 python:
-   version: 3.6
-   install:
-      - method: pip
-        path: .
-        extra_requirements:
-            - lint
-   system_packages: true
-
-sphinx:
-  configuration: docs/conf.py
+  install:
+    - method: pip
+      extra_requirements:
+        - lint
+      path: .
+  version: 3.8
+version: 2