trial: Fix unused import warning

warning: unused import: `TimeZone`
 --> src/trial.rs:5:44
  |
5 | use chrono::{DateTime, FixedOffset, Local, TimeZone};
  |                                            ^^^^^^^^
  |
  = note: #[warn(unused_imports)] on by default

1 files changed, 2 insertions, 1 deletions

diff --git a/src/trial.rs b/src/trial.rs
index 4e5d762..a6f670c 100644
--- a/src/trial.rs
+++ b/src/trial.rs
@@ -2,7 +2,7 @@ use std::fs::{File, OpenOptions};
 use std::io::{self, Read, Write};
 use std::result;
 
-use chrono::{DateTime, FixedOffset, Local, TimeZone};
+use chrono::{DateTime, FixedOffset, Local};
 use exitcode;
 use magic_crypt::{self, MagicCrypt};
 use xdg;
@@ -183,6 +183,7 @@ fn initialization_vector() -> String {
 
 #[cfg(test)]
 mod tests {
+    use chrono::TimeZone;
     use super::*;
 
     #[test]