remove generic parameters from Reconnect::new (#755)

these were not used, as the only parameters used
come from the impl block (directly and indirectly)

Co-authored-by: Toby Lawrence <tobz@users.noreply.github.com>

tower/src/reconnect/mod.rs

@@ -49,7 +49,7 @@ where
     M: Service<Target>,
 {
     /// Lazily connect and reconnect to a [`Service`].
-    pub fn new<S, Request>(mk_service: M, target: Target) -> Self {
+    pub fn new(mk_service: M, target: Target) -> Self {
         Reconnect {
             mk_service,
             state: State::Idle,