Update README.md

Update shields.io to use semver for the docker images.

README.md

@@ -1,6 +1,6 @@
 # Hello Kubernetes!
 
-[![Docker Image Version (latest by date)](https://img.shields.io/docker/v/paulbouwer/hello-kubernetes)](https://hub.docker.com/repository/docker/paulbouwer/hello-kubernetes) [![Docker Image Size (latest by date)](https://img.shields.io/docker/image-size/paulbouwer/hello-kubernetes)](https://hub.docker.com/repository/docker/paulbouwer/hello-kubernetes) [![Docker Pulls](https://img.shields.io/docker/pulls/paulbouwer/hello-kubernetes)](https://hub.docker.com/repository/docker/paulbouwer/hello-kubernetes)
+[![Docker Image Version (latest semver)](https://img.shields.io/docker/v/paulbouwer/hello-kubernetes?sort=semver)](https://hub.docker.com/repository/docker/paulbouwer/hello-kubernetes) [![Docker Image Size (latest semver)](https://img.shields.io/docker/image-size/paulbouwer/hello-kubernetes?sort=semver)](https://hub.docker.com/repository/docker/paulbouwer/hello-kubernetes) [![Docker Pulls](https://img.shields.io/docker/pulls/paulbouwer/hello-kubernetes)](https://hub.docker.com/repository/docker/paulbouwer/hello-kubernetes)
 
 This container image can be deployed on a Kubernetes cluster. It runs a web app, that displays the following:
 
@@ -68,4 +68,4 @@ If you'd like to build the `hello-kubernetes` container image yourself and refer
 
 ### Development environment
 
-If you have [VS Code](https://code.visualstudio.com/) and the [VS Code Remote Containers](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers) extension installed, the `.devcontainer` folder will be used to provide a container based development environment. You can read more about how to use this in the [Development environments](docs/development-environment.md) documentation.
+If you have [VS Code](https://code.visualstudio.com/) and the [VS Code Remote Containers](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers) extension installed, the `.devcontainer` folder will be used to provide a container based development environment. You can read more about how to use this in the [Development environments](docs/development-environment.md) documentation.