Merge pull request #18 from mputz86/master

Fixed initial cargo run due to invalid argument error

build.rs

@@ -2,6 +2,7 @@ use std::fs::{OpenOptions};
 
 fn main() {
     OpenOptions::new().create(true)
+        .write(true)
         .open("src/path_to_enlightenment.rs")
         .unwrap();
 }