Convert readthedocs links for their .org -> .io migration for hosted projects

As per [their blog post of the 27th April](https://blog.readthedocs.com/securing-subdomains/) ‘Securing subdomains’:

> Starting today, Read the Docs will start hosting projects from subdomains on the domain readthedocs.io, instead of on readthedocs.org. This change addresses some security concerns around site cookies while hosting user generated data on the same domain as our dashboard.

Test Plan: Manually visited all the links I’ve modified.

Signed-off-by: Adam Chainz <adam@adamj.eu>

4 files changed, 5 insertions, 5 deletions

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 75365c8..1bd8d42 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -20,7 +20,7 @@ pip freeze | grep docker-py && python --version && docker version
 - If possible, steps or a code snippet to reproduce the issue
 
 To save yourself time, please be sure to check our
-[documentation](http://docker-py.readthedocs.org/) and use the
+[documentation](https://docker-py.readthedocs.io/) and use the
 [search function](https://github.com/docker/docker-py/search) to find out if
 it has already been addressed, or is currently being looked at.
 
diff --git a/README.md b/README.md
index 0a70968..bdec785 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ Documentation
 
 [![Documentation Status](https://readthedocs.org/projects/docker-py/badge/?version=latest)](https://readthedocs.org/projects/docker-py/?badge=latest)
 
-[Read the full documentation here](http://docker-py.readthedocs.org/en/latest/).
+[Read the full documentation here](https://docker-py.readthedocs.io/en/latest/).
 The source is available in the `docs/` directory.
 
 
diff --git a/docs/change_log.md b/docs/change_log.md
index be818df..6db720a 100644
--- a/docs/change_log.md
+++ b/docs/change_log.md
@@ -213,7 +213,7 @@ Change Log
 ### Features
 
 * Added `utils.parse_env_file` to support env-files.
-  See [docs](http://docker-py.readthedocs.org/en/latest/api/#create_container)
+  See [docs](https://docker-py.readthedocs.io/en/latest/api/#create_container)
   for usage.
 * Added support for arbitrary log drivers
 * Added support for URL paths in the docker host URL (`base_url`)
@@ -577,7 +577,7 @@ Change Log
 ### Documentation
 
 * Added new MkDocs documentation. Currently hosted on
-  [ReadTheDocs](http://docker-py.readthedocs.org/en/latest/)
+  [ReadTheDocs](https://docker-py.readthedocs.io/en/latest/)
 
 ### Miscellaneous
 
diff --git a/mkdocs.yml b/mkdocs.yml
index dba8fdb..67b4089 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -1,7 +1,7 @@
 site_name: docker-py Documentation
 site_description: An API client for Docker written in Python
 site_favicon: favicon_whale.png
-site_url: http://docker-py.readthedocs.org
+site_url: https://docker-py.readthedocs.io
 repo_url: https://github.com/docker/docker-py/
 theme: readthedocs
 pages: