Satisfy new clippy lints.

src/lib.rs

@@ -342,11 +342,7 @@ type Syslog6TransformFn =
 /// [`OpenOptions`]: https://doc.rust-lang.org/std/fs/struct.OpenOptions.html
 #[inline]
 pub fn log_file<P: AsRef<Path>>(path: P) -> io::Result<File> {
-    OpenOptions::new()
-        .write(true)
-        .create(true)
-        .append(true)
-        .open(path)
+    OpenOptions::new().create(true).append(true).open(path)
 }
 
 /// Convenience method for opening a re-openable log file with common options.

src/log_impl.rs

@@ -236,11 +236,7 @@ impl DateBasedConfig {
     }
 
     pub fn open_log_file(path: &Path) -> io::Result<fs::File> {
-        OpenOptions::new()
-            .write(true)
-            .create(true)
-            .append(true)
-            .open(path)
+        OpenOptions::new().create(true).append(true).open(path)
     }
 
     pub fn open_current_log_file(&self, suffix: &str) -> io::Result<fs::File> {