avoid colliding with the configured admin nick

Cargo.lock

@@ -1953,7 +1953,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "sms-irc"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "chrono 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",

src/insp_s2s.rs

@@ -347,6 +347,9 @@ impl InspLink {
                 return true;
             }
         }
+        if nick == self.cfg.admin_nick {
+            return true;
+        }
         false
     }
     fn check_nick_for_collisions(&self, nick: &str) -> Option<String> {