Remove tests that require clippy

Looks like they're failing on nightly and hopefully we'll get enough coverage in
rust-lang/rust itself to cover these use cases.

Author: alexcrichton

.travis.yml

@@ -2,8 +2,6 @@ language: rust
 rust:
 - nightly
 - stable
-before_script:
-- if [ $TRAVIS_RUST_VERSION == nightly ]; then cargo install clippy --git https://github.com/rust-lang-nursery/rust-clippy.git --force; fi
 script:
 - cargo build
 - if [ $TRAVIS_RUST_VERSION == nightly ]; then cargo test -- --nocapture ; fi

tests/everything.rs

@@ -18,7 +18,7 @@ use rustfix::{Replacement, apply_suggestions};
 fn compile(file: &Path) -> Result<Output, Box<Error>> {
     let tmp = TempDir::new("rustfix-tests")?;
     let better_call_clippy = cmd!(
-        "clippy-driver", "rustc", file,
+        "rustc", file,
         "--error-format=pretty-json", "-Zunstable-options", "--emit=metadata",
         "--crate-name=rustfix_test",
         "--out-dir", tmp.path()