extern crate is not necessary anymore

Author: lqd

src/lib.rs

@@ -1,6 +1,3 @@
-extern crate polonius_engine;
-extern crate rustc_hash;
-
 mod dump;
 mod facts;
 mod intern;
@@ -10,6 +7,3 @@ mod test;
 mod test_util;
 
 pub mod cli;
-
-extern crate log;
-extern crate petgraph;