Removed a deprecation warning

ci/before_deploy.sh

@@ -6,6 +6,15 @@ main() {
     local src=$(pwd) \
           stage=
 
+    case $TRAVIS_OS_NAME in
+        linux)
+            stage=$(mktemp -d)
+            ;;
+        osx)
+            stage=$(mktemp -d -t tmp)
+            ;;
+    esac
+
     cargo rustc --bin mdbook --target $TARGET --release -- -C lto
 
     cp target/release/mdbook $stage/

src/renderer/html_handlebars/hbs_renderer.rs

@@ -6,7 +6,6 @@ use renderer::html_handlebars::helpers;
 use theme::{self, Theme, playpen_editor};
 use utils;
 
-#[allow(unused_imports)] use std::ascii::AsciiExt;
 use std::collections::BTreeMap;
 use std::collections::HashMap;
 use std::fs::{self, File};