shellcheck travis-ci vs. docker vs. downloader installs

[client9]

• travis-ci installs an (old) version of shell check
• GitHub has binary releases
• there is an official docker image too

Need to figure out which to so local dev and travis do the same thing

[client9]

travis-ci uses 0.46, current is 0.47 from https://github.com/koalaman/shellcheck/releases

$ shellcheck -V
ShellCheck - shell script analysis tool
version: 0.4.6
license: GNU General Public License, version 3
website: http://www.shellcheck.net

[syntaqx]

Looks like the current release is 0.6.0 and the released apt-get install is the same, closing.