Bump prometheus-to-sd version tag to 0.3.2
Bump prometheus-to-sd version tag to 0.3.2

GoogleCloudPlatform/k8s-stackdriver,kawych/k8s-stackdriver,GoogleCloudPlatform/k8s-stackdriver,GoogleCloudPlatform/k8s-stackdriver,kawych/k8s-stackdriver,kawych/k8s-stackdriver,kawych/k8s-stackdriver