Fix Traefik chart versioning scheme (#1082)

stable/traefik/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 name: traefik
-# Lock step with the Traefik version, appended with -a, -b, etc. to denote versions of the chart
-version: 1.2.1-b
+version: 1.3.0
+appVersion: 1.2.1
 description: A Traefik based Kubernetes ingress controller with Let's Encrypt support
 keywords:
 - traefik
@@ -13,7 +13,7 @@ sources:
 - https://github.com/containous/traefik
 - https://github.com/krancour/charts/tree/master/traefik
 maintainers:
-- name: Deis
-  email: engineering@deis.com
+- name: Kent Rancourt
+  email: kent.rancourt@microsoft.com
 engine: gotpl
 icon: http://traefik.io/traefik.logo.png

stable/traefik/README.md

@@ -23,6 +23,25 @@ external load balancer (e.g. AWS or GKE)
 - You control DNS for the domain(s) you intend to route through Traefik
 - __Suggested:__ PV provisioner support in the underlying infrastructure
 
+## A Quick Note on Versioning
+
+Up until version 1.2.1-b of this chart, the semantic version of the chart was
+kept in-sync with the semantic version of the (default) version of Traefik
+installed by the chart. A dash and a letter were appended to Traefik's
+semantic version to indicate incrementally improved versions of the chart
+itself. For example, chart version 1.2.1-a and 1.2.1-b _both_ provide Traefik
+1.2.1, but 1.2.1-b is a chart that is incrementally improved in some way from
+its immediate predecessor-- 1.2.1-a.
+
+This convention, in practice, suffered from a few problems, not the least of
+which was that it defied what was permitted by
+[semver 2.0.0](http://semver.org/spec/v2.0.0.html). This, in turn, lead to some
+difficulty in Helm understanding the versions of this chart.
+
+Beginning with version 1.3.0 of this chart, the version references _only_
+the revision of the chart itself. The `appVersion` field in `chart.yaml` now
+conveys information regarding the revision of Traefik that the chart provides.
+
 ## Installing the Chart
 
 To install the chart with the release name `my-release`: