rtiow: fix doc test error. Add warp to build.

rtiow/noise_explorer_warp/Cargo.toml

@@ -7,3 +7,13 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+askama = "0.7.1"
+image = "0.22.3"
+log = "0.4.5"
+rand = "0.5.5"
+renderer = { path = "../renderer" }
+serde = "1.0.79"
+serde_derive = "1.0.79"
+stderrlog = "0.4.1"
+structopt = "0.2.10"
+warp = "0.1.20"

rtiow/noise_explorer_warp/src/main.rs

@@ -1,3 +1,5 @@
+use warp;
+
 fn main() {
     println!("Hello, world!");
 }