Fix README test.

.pre-commit-config.yaml

@@ -0,0 +1,34 @@
+exclude: |
+  (?x)^(tests/.*/.*\.(out|parse))$
+repos:
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v3.2.0
+  hooks:
+  - id: trailing-whitespace
+  - id: end-of-file-fixer
+  - id: check-yaml
+  - id: check-added-large-files
+- repo: local
+  hooks:
+  - id: cargo-fmt
+    name: Cargo fmt
+    description: Run cargo fmt.
+    entry: cargo fmt
+    language: system
+    types: [rust]
+    pass_filenames: false
+  - id: cargo-test
+    name: Cargo test
+    description: Run cargo test.
+    entry: cargo test
+    language: system
+    types: [rust]
+    pass_filenames: false
+  - id: clippy
+    name: Clippy
+    description: Run clippy.
+    entry: cargo clippy
+    language: system
+    args: ["--", "-D", "warnings"]
+    types: [rust]
+    pass_filenames: false

README.md

@@ -23,8 +23,8 @@ fn test() {
     let mut file1 = mint.new_goldenfile("file1.txt").unwrap();
     let mut file2 = mint.new_goldenfile("file2.txt").unwrap();
 
-    write!(file1, "Hello world!").unwrap();
-    write!(file2, "Foo bar!").unwrap();
+    writeln!(file1, "Hello world!").unwrap();
+    writeln!(file2, "Foo bar!").unwrap();
 }
 ```
 

tests/goldenfiles/file1.txt

@@ -1 +1 @@
-Hello world!
+Hello world!

tests/goldenfiles/file2.txt

@@ -1 +1 @@
-Foo bar!
+Foo bar!

tests/goldenfiles/panic.txt

@@ -1 +1 @@
-old
+old

tests/goldenfiles/update1.txt

@@ -1 +1 @@
-Hello world!
+Hello world!

tests/goldenfiles/update2.txt

@@ -1 +1 @@
-foobar
+foobar

tests/readme_usage.rs

@@ -10,6 +10,6 @@ fn test() {
     let mut file1 = mint.new_goldenfile("file1.txt").unwrap();
     let mut file2 = mint.new_goldenfile("file2.txt").unwrap();
 
-    write!(file1, "Hello world!").unwrap();
-    write!(file2, "Foo bar!").unwrap();
+    writeln!(file1, "Hello world!").unwrap();
+    writeln!(file2, "Foo bar!").unwrap();
 }