Update webfinger and reqwest

Update webfinger to 0.3.1
Update reqwest to 0.9
Fix #257

plume-common/src/lib.rs

@@ -13,7 +13,6 @@ extern crate failure_derive;
 extern crate gettextrs;
 extern crate hex;
 extern crate heck;
-#[macro_use]
 extern crate hyper;
 extern crate openssl;
 extern crate pulldown_cmark;