Make a few modules private

src/lib.rs

@@ -20,17 +20,17 @@ extern crate wild;
 
 pub mod assets;
 pub mod controller;
-pub mod decorations;
-pub mod diff;
+mod decorations;
+mod diff;
 pub mod dirs;
 pub mod inputfile;
 pub mod line_range;
 pub mod output;
-pub mod preprocessor;
+mod preprocessor;
 pub mod printer;
 pub mod style;
 pub mod syntax_mapping;
-pub mod terminal;
+mod terminal;
 
 pub mod errors {
     error_chain! {