diff -up roff-0.1.0/tests/demo.rs.orig roff-0.1.0/tests/demo.rs
--- roff-0.1.0/tests/demo.rs.orig	2018-04-18 23:09:27.000000000 +0200
+++ roff-0.1.0/tests/demo.rs	2019-09-27 12:45:29.912714021 +0200
@@ -4,7 +4,7 @@ extern crate duct;
 
 fn roff_to_ascii(input: &str) -> String {
     duct::cmd("troff", &["-a", "-mman"])
-        .input(input)
+        .stdin_bytes(input)
         .stdout_capture()
         .read()
         .unwrap()