Add redis app, helm as a tool and fix loki app

Changelog for 0.3.8:

• PR #125 Fixes #43: Add redis app by @aidun
• PR #134 Fix the path on loki helm install by @Waterdrips
• PR #127 Added nfs-client-provisioner app by @kadern0
• PR #133 Add support for tgz/zip archives to the get command by @alexellis

# Update with "arkade update" - or install via get-arkade.dev

# Install apps
arkade install redis
arkade install loki
arkade install nfs-client-provisioner

# Install CLIs
arkade get kubectx
arkade get kubectl
arkade get faas-cli
arkade get helm

Commits
6f45343 Fixes #43: Add redis app by @aidun
7781e43 Fix the path on loki helm install by @Waterdrips
877b5e2 Added nfs-client-provisioner app by @kadern0
34a72de Refactor Unzip to create zipReader within method by @alexellis
39f2794 Add support for tgz/zip archives to the get command by @tuananh

Generated by Derek