Update deployment to work on Helm 2.14.1

Signed-off-by: Maartje Eyskens <maartje@eyskens.me>

Author: meyskens

.drone.yml

@@ -27,10 +27,10 @@ docker_image: &docker_image
  debug: true
 
 helm_deploy: &helm_deploy
- image: quay.io/ipedrazas/drone-helm:master-9b37211
+ image: quay.io/ipedrazas/drone-helm@sha256:43a6e6f907e68925fdb46601981242d68c41eb3e67154d8675627e19fd78f216
  skip_tls_verify: true
- helm_repos: srcd-stable=https://src-d.github.io/charts/stable/
- chart: srcd-stable/gitbase-web
+ helm_repos: srcd-charts=https://src-d.github.io/charts/
+ chart: srcd-charts/gitbase-web
  chart-version: 0.5.0
  release: gp
  tiller_ns: kube-system