Clear data before new bar display iteration

This makes sure that data displayed is always fresh

src/main.rs

@@ -86,13 +86,15 @@ impl Unibar {
         for md in &mut self.bar_modules_enabled {
             let mut mod_parts = Vec::new();
 
-            // Each bar module implements following 3 steps:
+            // Each bar module implements following 4 steps:
+            //   * Clear data from previous iteration
             //   * Generate raw data with pertinent information
             //   * Return a unicode icon to be displayed
             //   * Return a String content to be displayed after the icon
             //
             // Following generates ICON+CONTENT string for a module to be displayed
             // in the bar
+            md.clear();
             md.generate_data();
             mod_parts.push(md.get_icon());
             mod_parts.push(md.get_content());