Update examples

examples/simple.rs

@@ -1,12 +1,9 @@
 /// A simple program that prints its own source code using the bat library
 use bat::PrettyPrinter;
-use std::ffi::OsStr;
 
 fn main() {
-    let path_to_this_file = OsStr::new(file!());
-
     PrettyPrinter::new()
-        .input_file(path_to_this_file)
+        .input_file(file!())
         .print()
         .expect("no errors");
 }