Tchannel is broke if applications do not install the thrift package

[HelloGrayson]

Even though my application never interacts with thrift directly, tchannel still blows up because it imports thrift in the health endpoint, and probably zipkin. This makes no sense... we need to either:

A.) Add thrift to setup_requires as long as setup requires thrift
B.) Remove dependency on thrift entirely using thriftrw

[HelloGrayson]

wrong repo :\