small problems

[Cheng JIANG]

1. remove the following unwrap
   

   actix-casbin-auth/src/middleware.rs

   Line 38 in 31e6808

    let enforcer: CachedEnforcer = CachedEnforcer::new(m, a).await.unwrap(); 

2. change to sync function, async will has at least 100ns's overhead
   

   actix-casbin-auth/src/middleware.rs

   Line 44 in 31e6808

    pub async fn get_enforcer(&mut self) -> Arc<RwLock<CachedEnforcer>> { 

3. change to sync function
   

   actix-casbin-auth/src/middleware.rs

   Line 48 in 31e6808

    pub async fn set_enforcer(e: Arc<RwLock<CachedEnforcer>>) -> Self { 

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[Eason Chai]

Fixed in #19