update links in README

mostly s/http/https/

this file is almost a copy of docs/overview. Maybe it shouldn’t be duplicated?

README.md

@@ -1,10 +1,10 @@
-# kubespawner (jupyterhub-kubernetes-spawner) #
+# kubespawner (jupyterhub-kubespawner) #
 
 The *kubespawner* (also known as JupyterHub Kubernetes Spawner) enables JupyterHub to spawn
 single-user notebook servers on a [Kubernetes](https://kubernetes.io/)
 cluster.
 
-You can read a list of all the spawner options [available on ReadTheDocs](http://jupyterhub-kubespawner.readthedocs.io/en/latest/spawner.html#module-kubespawner.spawner).
+You can read a list of all the spawner options [available on ReadTheDocs](https://jupyterhub-kubespawner.readthedocs.io/en/latest/spawner.html#module-kubespawner.spawner).
 
 ## Features ##
 
@@ -23,26 +23,26 @@ simultaneous users), Kubernetes is a wonderful way to do it. Features include:
   monitoring and failover for the hub process itself.
 
 * Spawn multiple hubs in the same kubernetes cluster, with support for
-  [namespaces](http://kubernetes.io/docs/admin/namespaces/). You can limit the
+  [namespaces](https://kubernetes.io/docs/admin/namespaces/). You can limit the
   amount of resources each namespace can use, effectively limiting the amount
   of resources a single JupyterHub (and its users) can use. This allows
   organizations to easily maintain multiple JupyterHubs with just one
   kubernetes cluster, allowing for easy maintenance & high resource
   utilization.
 
 * Provide guarantees and limits on the amount of resources (CPU / RAM) that
-  single-user notebooks can use. Kubernetes has comprehensive [resource control](http://kubernetes.io/docs/user-guide/compute-resources/) that can
+  single-user notebooks can use. Kubernetes has comprehensive [resource control](https://kubernetes.io/docs/user-guide/compute-resources/) that can
   be used from the spawner.
 
-* Mount various types of [persistent volumes](http://kubernetes.io/docs/user-guide/persistent-volumes/)
+* Mount various types of [persistent volumes](https://kubernetes.io/docs/user-guide/persistent-volumes/)
   onto the single-user notebook's container.
 
 * Control various security parameters (such as userid/groupid, SELinux, etc)
-  via flexible [Pod Security Policies](http://kubernetes.io/docs/user-guide/pod-security-policy/).
+  via flexible [Pod Security Policies](https://kubernetes.io/docs/user-guide/pod-security-policy/).
 
 * Run easily in multiple clouds (or on your own machines). Helps avoid vendor
   lock-in. You can even spread out your cluster across
-  [multiple clouds at the same time](http://kubernetes.io/docs/user-guide/federation/).
+  [multiple clouds at the same time](https://kubernetes.io/docs/user-guide/federation/).
 
 In general, Kubernetes provides a ton of well thought out, useful features -
 and you can use all of them along with this spawner.
@@ -51,11 +51,11 @@ and you can use all of them along with this spawner.
 
 ### Kubernetes ###
 
-Everything should work from Kubernetes v1.2+.
+Everything should work from Kubernetes v1.6+.
 
-The [Kube DNS addon](http://kubernetes.io/docs/user-guide/connecting-applications/#dns)
+The [Kube DNS addon](https://kubernetes.io/docs/user-guide/connecting-applications/#dns)
 is not strictly required - the spawner uses
-[environment variable](http://kubernetes.io/docs/user-guide/connecting-applications/#environment-variables)
+[environment variable](https://kubernetes.io/docs/user-guide/connecting-applications/#environment-variables)
 based discovery instead. Your kubernetes cluster will need to be configured to
 support the types of volumes you want to use.
 
@@ -83,10 +83,10 @@ All code is licensed under the terms of the revised BSD license.
 #### JupyterHub and kubespawner
 
 - [Reporting Issues](https://github.com/jupyterhub/kubespawner/issues)
-- [Documentation for JupyterHub](http://jupyterhub.readthedocs.io/en/latest/) | [PDF (latest)](https://media.readthedocs.org/pdf/jupyterhub/latest/jupyterhub.pdf) | [PDF (stable)](https://media.readthedocs.org/pdf/jupyterhub/stable/jupyterhub.pdf)
-- [Documentation for JupyterHub's REST API](http://petstore.swagger.io/?url=https://raw.githubusercontent.com/jupyter/jupyterhub/master/docs/rest-api.yml#/default)
+- [Documentation for JupyterHub](https://jupyterhub.readthedocs.io)
+- [Documentation for JupyterHub's REST API](https://petstore.swagger.io/?url=https://raw.githubusercontent.com/jupyter/jupyterhub/master/docs/rest-api.yml#/default)
 
 #### Jupyter
 
-- [Documentation for Project Jupyter](http://jupyter.readthedocs.io/en/latest/index.html) | [PDF](https://media.readthedocs.org/pdf/jupyter/latest/jupyter.pdf)
+- [Documentation for Project Jupyter](https://jupyter.readthedocs.io/en/latest/index.html) | [PDF](https://media.readthedocs.org/pdf/jupyter/latest/jupyter.pdf)
 - [Project Jupyter website](https://jupyter.org)