remove trailing spaces

README.md

@@ -3,11 +3,11 @@ A package (currently just `diff`, but eventually more) of programs related to fi
 Based on the incomplete diff generator in https://github.com/rust-lang/rust/blob/master/src/tools/compiletest/src/runtest.rs, and made to be compatible with GNU's diff and patch tools.
 
 ```
-~/diffutils$ cargo run -- diff -u3 Cargo.lock Cargo.toml 
+~/diffutils$ cargo run -- diff -u3 Cargo.lock Cargo.toml
     Finished dev [unoptimized + debuginfo] target(s) in 0.00s
      Running `target/debug/diff -u3 Cargo.lock Cargo.toml`
---- Cargo.lock	
-+++ Cargo.toml	
+--- Cargo.lock
++++ Cargo.toml
 @@ -1,39 +1,7 @@
 -# This file is automatically @generated by Cargo.
 -# It is not intended for manual editing.
@@ -55,4 +55,3 @@ Based on the incomplete diff generator in https://github.com/rust-lang/rust/blob
 +    "bin/diff",
  ]
 ```
-