opti(mutex): make new a const fn

Author: librelois

async-mutex/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "async-mutex"
-version = "1.3.0"
+version = "1.4.0"
 authors = ["Stjepan Glavina <stjepang@gmail.com>"]
 edition = "2018"
 description = "Async mutex"

async-mutex/src/lib.rs

@@ -62,7 +62,7 @@ impl<T> Mutex<T> {
     ///
     /// let mutex = Mutex::new(0);
     /// ```
-    pub fn new(data: T) -> Mutex<T> {
+    pub const fn new(data: T) -> Mutex<T> {
         Mutex {
             state: AtomicUsize::new(0),
             lock_ops: Event::new(),