Add @here command

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "desubot"
-version = "0.5.1"
+version = "0.5.2"
 authors = ["AB <ab@hexor.ru>"]
 edition = "2018"
 

src/handlers.rs

@@ -53,7 +53,7 @@ pub async fn handler(
                         }
                     }
                 }
-                s if s.contains("/here") => {
+                s if s.contains("/here") || s.contains("@here") => {
                     db::add_sentence(&message, mystem).await?;
                     Here {
                         data: "".to_string(),