Merge branch 'master' of github.com:rtfd/readthedocs-docker-images into humitos/build-images-design-doc

Author: humitos

README.rst

@@ -24,19 +24,19 @@ repository:
     **Deprecated**
     Ubuntu 18.04 supporting Python 2.7, 3.5, 3.6, 3.7.
 
-`readthedocs/build:6.0`
+`readthedocs/build:5.0`
     ``stable``
-    Ubuntu 18.04 supporting Python 2.7, 3.5, 3.6, 3.7, 3.8 and PyPy3.5-7.0.0.
+    Ubuntu 18.04 supporting Python 2.7, 3.6, 3.7 and pypy3.5-7.0.0.
     This is the **stable** image supported by Read the Docs.
 
-`readthedocs/build:7.0`
+`readthedocs/build:6.0`
     ``latest``
     Ubuntu 18.04 supporting Python 2.7, 3.5, 3.6, 3.7, 3.8 and PyPy3.5-7.0.0.
     This is the **latest** default image used for documentation builds and supported by Read the Docs.
 
-`readthedocs/build:8.0`
+`readthedocs/build:7.0`
     ``testing``
-    Ubuntu 20.04 supporting Python 2.7, 3.5, 3.6, 3.7, 3.8, 3.9.0rc1 and PyPy3.5-7.0.0.
+    Ubuntu 18.04 supporting Python 2.7, 3.5, 3.6, 3.7, 3.8, 3.9, and PyPy3.5-7.0.0.
     Available for public usage as **testing** image. You should expect some breaking changes here.
 
 .. _readthedocs/build: https://hub.docker.com/r/readthedocs/build/