.jshintrc

contrib: print the version of pytype used to do the type checking

This will help with CI.  I don't see a way to print the version of python that's
running it.  When I tried `head -n 1 $(which pytype)`, the CI run printed:

    #!/usr/bin/env bash

Locally, that gives the path to the python interpreter in the venv, so IDK
what's different.

{
    // Enforcing
    "eqeqeq"        : true,     // true: Require triple equals (===) for comparison
    "forin"         : true,     // true: Require filtering for..in loops with obj.hasOwnProperty()
    "freeze"        : true,     // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
    "nonbsp"        : true,     // true: Prohibit "non-breaking whitespace" characters.
    "undef"         : true,     // true: Require all non-global variables to be declared (prevents global leaks)

    // Environments
    "browser"       : true      // Web Browser (window, document, etc)
}