helm: update adapter Docker tag to 0.1.1 (#66)

This updates the Docker image tag in the Helm manifest to point to the
latest released adapter version 0.1.1.

Signed-off-by: Venil Noronha <veniln@vmware.com>

install/config.yaml

@@ -38,7 +38,7 @@ spec:
     spec:
       containers:
       - name: wavefront
-        image: vmware/wavefront-adapter-for-istio:0.1.0
+        image: vmware/wavefront-adapter-for-istio:0.1.1
         imagePullPolicy: Always
         ports:
         - containerPort: 8000