Chocolatey fails to install due to chocolatey.org TLS 1.2 requirements not being set in install script

[pauby]

What You Are Seeing?

Downloading Boxstarter from the website and running setup.bat fails to install Chocolatey.

What Is Expected?

Running the setup.bat installs Chcolatey and Boxstarter.

How Did You Get This To Happen? (Steps to Reproduce)

1. Go to Boxstarter.org, click 'Download v2.12', download the ZIP file and extract it;
2. In the folder where the ZIP was extracted run setup.bat

Output Log

Exception calling "DownloadString" with "1" argument(s): "The request was aborted: Could not create SSL/TLS secure
channel."
At C:\Users\Administrator\Downloads\bootstrapper.ps1:75 char:13
+             iex ($wc.DownloadString("https://chocolatey.org/install.ps1"))
+             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : WebException

[pauby]

Using the install instructions the main one, using CINST works fine (as to have this installed or working with the Chocolatey Community Repository you would already have had to have TLS 1.2 enabled) and this appears to be the way the vast majority of users are installing boxstarter (from experience). However, using the bootstrapper.ps1 without TLS 1.2 enabled fails. So we need to add that support to bootstrapper.ps1;