fix Helm repo and update instruction for Helm 3 (#22)

Author: elnappo

helm/oauth2-proxy/Chart.yaml

@@ -1,5 +1,5 @@
 name: oauth2-proxy
-version: 3.2.9
+version: 3.2.10
 apiVersion: v2
 appVersion: 5.1.0
 home: https://oauth2-proxy.github.io/oauth2-proxy/

helm/oauth2-proxy/README.md

@@ -6,7 +6,7 @@
 
 ```console
 $ helm repo add oauth2-proxy https://oauth2-proxy.github.io/manifests
-$ helm install oauth2-proxy/oauth2-proxy
+$ helm install my-release oauth2-proxy/oauth2-proxy
 ```
 
 ## Introduction
@@ -18,7 +18,7 @@ This chart bootstraps an oauth2-proxy deployment on a [Kubernetes](http://kubern
 To install the chart with the release name `my-release`:
 
 ```console
-$ helm install stable/oauth2-proxy --name my-release
+$ helm install my-release oauth2-proxy/oauth2-proxy
 ```
 
 The command deploys oauth2-proxy on the Kubernetes cluster in the default configuration. The [configuration](#configuration) section lists the parameters that can be configured during installation.
@@ -28,7 +28,7 @@ The command deploys oauth2-proxy on the Kubernetes cluster in the default config
 To uninstall/delete the `my-release` deployment:
 
 ```console
-$ helm delete my-release
+$ helm uninstall my-release
 ```
 
 The command removes all the Kubernetes components associated with the chart and deletes the release.
@@ -136,14 +136,14 @@ Parameter | Description | Default
 Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example,
 
 ```console
-$ helm install stable/oauth2-proxy --name my-release \
+$ helm install my-release oauth2-proxy/oauth2-proxy \
   --set=image.tag=v0.0.2,resources.limits.cpu=200m
 ```
 
 Alternatively, a YAML file that specifies the values for the above parameters can be provided while installing the chart. For example,
 
 ```console
-$ helm install stable/oauth2-proxy --name my-release -f values.yaml
+$ helm install my-release oauth2-proxy/oauth2-proxy -f values.yaml
 ```
 
 > **Tip**: You can use the default [values.yaml](values.yaml)