grouped imports more nicely

src/lib.rs

@@ -1,6 +1,7 @@
 pub mod lib {
     use std::io::Write;
     use std::fs;
+
     use zip;
 
     const ERR_CANNOT_WRITE_DATA: &str = "Could not write data";

src/main.rs

@@ -1,7 +1,8 @@
 use std::{fs, str};
-
 use std::io::{BufRead, BufReader};
+
 use zip;
+
 use tacview_splitter::lib;
 use tacview_splitter::lib::Handling;