matrix-sdk: Remove an useless import.

matrix_sdk/examples/image_bot.rs

@@ -1,4 +1,3 @@
-use mime;
 use std::{
     env,
     fs::File,

matrix_sdk/src/client.rs

@@ -1952,7 +1952,6 @@ mod test {
         thirdparty,
     };
     use matrix_sdk_test::{test_json, EventBuilder, EventsJson};
-    use mime;
     use mockito::{mock, Matcher};
     use serde_json::json;
     use tempfile::tempdir;