update customizing kube-prometheus installing section

raised the version of kube-prometheus to 0.7 in the customizing
kube-prometheus installing section

README.md

@@ -186,15 +186,15 @@ Install this library in your own project with [jsonnet-bundler](https://github.c
 $ mkdir my-kube-prometheus; cd my-kube-prometheus
 $ jb init  # Creates the initial/empty `jsonnetfile.json`
 # Install the kube-prometheus dependency
-$ jb install github.com/prometheus-operator/kube-prometheus/jsonnet/kube-prometheus@release-0.4 # Creates `vendor/` & `jsonnetfile.lock.json`, and fills in `jsonnetfile.json`
+$ jb install github.com/prometheus-operator/kube-prometheus/jsonnet/kube-prometheus@release-0.7 # Creates `vendor/` & `jsonnetfile.lock.json`, and fills in `jsonnetfile.json`
 
-$ wget https://raw.githubusercontent.com/prometheus-operator/kube-prometheus/release-0.4/example.jsonnet -O example.jsonnet
-$ wget https://raw.githubusercontent.com/prometheus-operator/kube-prometheus/release-0.4/build.sh -O build.sh
+$ wget https://raw.githubusercontent.com/prometheus-operator/kube-prometheus/release-0.7/example.jsonnet -O example.jsonnet
+$ wget https://raw.githubusercontent.com/prometheus-operator/kube-prometheus/release-0.7/build.sh -O build.sh
 ```
 
 > `jb` can be installed with `go get github.com/jsonnet-bundler/jsonnet-bundler/cmd/jb`
 
-> An e.g. of how to install a given version of this library: `jb install github.com/prometheus-operator/kube-prometheus/jsonnet/kube-prometheus@release-0.4`
+> An e.g. of how to install a given version of this library: `jb install github.com/prometheus-operator/kube-prometheus/jsonnet/kube-prometheus@release-0.7`
 
 In order to update the kube-prometheus dependency, simply use the jsonnet-bundler update functionality:
 ```shell