Fixed a small error : `Sanic.__init__` doesn't have a `load_vars` parameter.
Fixed a small error : `Sanic.__init__` doesn't have a `load_vars` parameter.

It is `load_env`.

r0fls/sanic,ashleysommer/sanic,lixxu/sanic,Tim-Erwin/sanic,channelcat/sanic,yunstanford/sanic,r0fls/sanic,lixxu/sanic,yunstanford/sanic,channelcat/sanic,yunstanford/sanic,ashleysommer/sanic,Tim-Erwin/sanic,lixxu/sanic,channelcat/sanic,lixxu/sanic,ashleysommer/sanic,channelcat/sanic,yunstanford/sanic