should add docs how to install, upgrade, downgrade: kubectl, helm on macOS, Linux (Ubuntu) and Windows with autocompletion

[teracyhq-incubator]

should add docs how to install, upgrade, downgrade: kubectl, helm on macOS, Linux (Ubuntu) and Windows with autocompletion

[hoatle]

on Mac, it's easy to switch between package versions, for example:

macbook-pro:artifacts hoatle$ helm version
Client: &version.Version{SemVer:"v2.12.1", GitCommit:"02a47c7249b1fc6d8fd3b94e6b4babf9d818144e", GitTreeState:"clean"}
Server: &version.Version{SemVer:"v2.11.0", GitCommit:"2e55dbe1fdb5fdb96b75ff144a339489417b146b", GitTreeState:"clean"}
macbook-pro:artifacts hoatle$ brew info helm
Error: No available formula with the name "helm" 
It was migrated from homebrew/cask to homebrew/core.
macbook-pro:artifacts hoatle$ brew info kubernetes-helm
kubernetes-helm: stable 2.12.1 (bottled), HEAD
The Kubernetes package manager
https://helm.sh/
/usr/local/Cellar/kubernetes-helm/2.3.1 (42 files, 48.2MB)
  Poured from bottle on 2017-05-03 at 22:03:26
/usr/local/Cellar/kubernetes-helm/2.4.2 (48 files, 122.4MB)
  Poured from bottle on 2017-05-26 at 21:15:29
/usr/local/Cellar/kubernetes-helm/2.6.1 (48 files, 132.5MB)
  Poured from bottle on 2017-09-12 at 11:12:13
/usr/local/Cellar/kubernetes-helm/2.7.2 (50 files, 93.6MB)
  Poured from bottle on 2018-01-07 at 13:26:20
/usr/local/Cellar/kubernetes-helm/2.8.2 (50 files, 121.7MB)
  Poured from bottle on 2018-04-13 at 01:07:31
/usr/local/Cellar/kubernetes-helm/2.9.1 (50 files, 66.2MB)
  Poured from bottle on 2018-06-28 at 01:01:52
/usr/local/Cellar/kubernetes-helm/2.10.0 (50 files, 67MB)
  Poured from bottle on 2018-09-18 at 18:33:33
/usr/local/Cellar/kubernetes-helm/2.11.0 (50 files, 78.4MB)
  Poured from bottle on 2018-10-04 at 15:46:02
/usr/local/Cellar/kubernetes-helm/2.12.1 (51 files, 79.4MB) *
  Poured from bottle on 2019-01-14 at 18:31:00
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/kubernetes-helm.rb
==> Dependencies
Build: glide ✘, go ✔, mercurial ✘
==> Options
--HEAD
    Install HEAD version
==> Caveats
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
==> Analytics
install: 21,002 (30 days), 52,847 (90 days), 166,250 (365 days)
install_on_request: 20,600 (30 days), 51,927 (90 days), 163,478 (365 days)
build_error: 0 (30 days)
macbook-pro:artifacts hoatle$ brew switch kubernetes-helm 2.11.0
Cleaning /usr/local/Cellar/kubernetes-helm/2.10.0
Cleaning /usr/local/Cellar/kubernetes-helm/2.3.1
Cleaning /usr/local/Cellar/kubernetes-helm/2.9.1
Cleaning /usr/local/Cellar/kubernetes-helm/2.8.2
Cleaning /usr/local/Cellar/kubernetes-helm/2.12.1
Cleaning /usr/local/Cellar/kubernetes-helm/2.7.2
Cleaning /usr/local/Cellar/kubernetes-helm/2.11.0
Cleaning /usr/local/Cellar/kubernetes-helm/2.6.1
Cleaning /usr/local/Cellar/kubernetes-helm/2.4.2
46 links created for /usr/local/Cellar/kubernetes-helm/2.11.0
macbook-pro:artifacts hoatle$ clear

macbook-pro:artifacts hoatle$ helm version
Client: &version.Version{SemVer:"v2.11.0", GitCommit:"2e55dbe1fdb5fdb96b75ff144a339489417b146b", GitTreeState:"clean"}
Server: &version.Version{SemVer:"v2.11.0", GitCommit:"2e55dbe1fdb5fdb96b75ff144a339489417b146b", GitTreeState:"clean"}

make sure to include docs how to install different versions of packages to switch, related on how: https://github.com/teracyhq/dev/pull/588/files#r246476469

[hoatle]

should add docs how to upgrade/ downgrade to the desired versions

[hoatle]

timeout for v0.3.0, moved to v0.4.0 instead.