Update gradle to the latest release

[tim-hellhake]

Expected Behaviour

The latest gradle version is used (5.1.1).

Current Behaviour

The used gradle version is 4.8.1.

Possible Solution

Update the gradle version in the Dockerfile and the property files for the gradle wrappers.

Steps to Reproduce (for bugs)

1. 2. 3. 4.

Context

Gradle version is outdated.

Your Environment

• Docker version docker version (e.g. Docker 17.0.05 ): 18.09.2

• Are you using Docker Swarm or Kubernetes (FaaS-netes)? Kubernetes

• Operating System and version (e.g. Linux, Windows, MacOS): Linux

• Link to your project or a code example to reproduce issue:

[alexellis]

Hi @tim-hellhake

Thank you for your interest in the project.

Please fill out the whole issue template, this is not optional.

https://github.com/openfaas/templates/blob/master/.github/ISSUE_TEMPLATE.md

Alex

[alexellis]

Derek close: fixed, latest is now live.