TLS 1.2 support

Explicitly support TLS 1.2 for install.

New option: Install a specific version

Merge pull request #3 from petemounce/patch-1

Allow a specific version to be installed

1.1.1

Default to using 7-zip for unarchiving the chocolatey installer.

1.1.0

Add the option to use Windows compression for chocolatey install instead of 7-zip.

1.0.1

Bump minimum ansible version to 2.3 for using the win_path module to add Chocolatey to the environment PATH.