Update readme and examples for v2.3.1 release (#148)

Signed-off-by: Reinhard Nägele <reinhard.naegele@codecentric.de>

README.md

@@ -36,7 +36,7 @@ available tags [here](https://quay.io/repository/helmpack/chart-testing?tab=tags
 
 ### From Source
 
-To install from head with [Go](https://golang.org) v1.10.1 or higher:
+To install from head with [Go](https://golang.org) 1.12.4 or higher:
 
 ```cli
 go get github.com/helm/chart-testing/ct
@@ -132,7 +132,7 @@ helm-repo-extra-args:
 
 ## Building from Source
 
-`ct` is built using Go 1.11. Older versions may work but have not been tested.
+`ct` is built using Go 1.12.4. Older versions may work but have not been tested.
 
 `build.sh` is used to build and release the tool. It uses [Goreleaser](https://goreleaser.com/) under the covers.
 
@@ -199,7 +199,7 @@ Run the script specifying the version for the new release.
 ./tag.sh --tag <release_version>
 ```
 
-Versions must start with a lower-case `v`, e. g. `v2.2.0`.
+Versions must start with a lower-case `v`, e. g. `v2.3.1`.
 
 
 ## Supported versions

examples/docker-for-mac/my_test.sh

@@ -18,7 +18,7 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
-readonly IMAGE_TAG=v2.2.0
+readonly IMAGE_TAG=v2.3.1
 readonly IMAGE_REPOSITORY="quay.io/helmpack/chart-testing"
 
 main() {

examples/gke/Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM quay.io/helmpack/chart-testing:v2.2.0
+FROM quay.io/helmpack/chart-testing:v2.3.1
 
 ENV PATH /google-cloud-sdk/bin:$PATH
 ARG CLOUD_SDK_VERSION=221.0.0

examples/kind/.circleci/config.yml

@@ -10,7 +10,7 @@ jobs:
 
   lint-charts:
     docker:
-      - image: quay.io/helmpack/chart-testing:v2.2.0
+      - image: quay.io/helmpack/chart-testing:v2.3.1
     steps:
       - checkout
       - run:

examples/kind/test/e2e-kind.sh

@@ -4,7 +4,7 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
-readonly CT_VERSION=v2.2.0
+readonly CT_VERSION=v2.3.1
 readonly KIND_VERSION=0.2.1
 readonly CLUSTER_NAME=chart-testing
 readonly K8S_VERSION=v1.13.4