Removed mut from runtime

Cargo.toml

@@ -8,7 +8,6 @@ readme = "README"
 homepage = "gemini://80h.dev"
 repository = "https://git.sr.ht/~int80h/gemserv"
 license = "MIT"
-license-file = "LICENSE"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

src/main.rs

@@ -442,7 +442,7 @@ fn main() -> io::Result<()> {
         .next()
         .ok_or_else(|| io::Error::from(io::ErrorKind::AddrNotAvailable))?;
 
-    let mut runtime = runtime::Builder::new_multi_thread()
+    let runtime = runtime::Builder::new_multi_thread()
     //    .threaded_scheduler()
         .enable_io()
         .enable_time()