feat(test): use new rustfmt-preview

.travis.yml

@@ -6,12 +6,11 @@ rust:
   - stable
   - beta
   - nightly
-before_install:
-  - bash ./tests/scripts/rustfmt.sh
 
 script:
-  - cargo fmt -- --write-mode diff
   - cargo test
+  - rustup component add rustfmt-preview
+  - cargo fmt -- --write-mode diff
 matrix:
   allow_failures:
     - rust: nightly

src/lib.rs

@@ -1,8 +1,8 @@
+extern crate failure;
 #[macro_use]
 extern crate serde_derive;
 extern crate serde_json;
 extern crate toml;
-extern crate failure;
 
 use std::fs::File;
 use std::io::prelude::*;

tests/scripts/rustfmt.sh

@@ -1,13 +0,0 @@
-#!/bin/bash
-
-which rustfmt > /dev/null
-
-if [[ $? -ne 0 ]]; then
-  cargo install rustfmt
-else
-  current_version=$(rustfmt --version | cut -d '-' -f 1 | xargs)
-  upstream_version=$(cargo search rustfmt | head -n 1 | cut -d ' ' -f 3 | tr -d '"' | xargs)
-  if [ $current_version != $upstream_version ]; then
-    cargo install rustfmt --force
-  fi
-fi