[fix] log file needs to be opened create + append

src/main.rs

@@ -35,7 +35,13 @@ fn print_delete_line(output: &mut StdoutLock) -> LogtimesResult {
 }
 
 fn run() -> LogtimesResult {
-    let mut log_file = args().nth(1).map(|f| File::create(f).unwrap());
+    let mut log_file = args().nth(1).map(|f| {
+        File::options()
+            .create(true)
+            .append(true)
+            .open(f)
+            .expect("Could not open log file")
+    });
 
     let out = stdout();
     let mut output = out.lock();