Removed the autoload and now include `Assert::Rack::Test`
Removed the autoload and now include `Assert::Rack::Test`

This removes the autoload of the version file and just requires it directly. It
also modifies the pattern of adding rack-test methods to `Assert::Context` and
instead includes the module `Assert::Rack::Test`. This should be more robust
for future needs but still provides the same functionality.

redding/assert-rack-test