Revert "temporarily ignore test case about coap.me"

This reverts commit fb83108.

src/client.rs

@@ -1048,7 +1048,6 @@ mod test {
     }
 
     #[tokio::test]
-    #[ignore]
     async fn test_get_url() {
         let resp = UdpCoAPClient::get("coap://coap.me:5683/hello")
             .await
@@ -1073,7 +1072,6 @@ mod test {
     }
 
     #[tokio::test]
-    #[ignore]
     async fn test_get() {
         let domain = "coap.me";
         let client = UdpCoAPClient::new_udp((domain, 5683)).await.unwrap();
@@ -1093,7 +1091,6 @@ mod test {
         assert_eq!(resp.message.payload, b"world".to_vec());
     }
     #[tokio::test]
-    #[ignore]
     async fn test_post_url() {
         let resp = UdpCoAPClient::post("coap://coap.me:5683/validate", b"world".to_vec())
             .await
@@ -1106,7 +1103,6 @@ mod test {
     }
 
     #[tokio::test]
-    #[ignore]
     async fn test_post() {
         let domain = "coap.me";
         let client = UdpCoAPClient::new_udp((domain, 5683)).await.unwrap();
@@ -1127,7 +1123,6 @@ mod test {
     }
 
     #[tokio::test]
-    #[ignore]
     async fn test_put_url() {
         let resp = UdpCoAPClient::put("coap://coap.me:5683/create1", b"world".to_vec())
             .await
@@ -1140,7 +1135,6 @@ mod test {
     }
 
     #[tokio::test]
-    #[ignore]
     async fn test_put() {
         let domain = "coap.me";
         let client = UdpCoAPClient::new_udp((domain, 5683)).await.unwrap();
@@ -1157,7 +1151,6 @@ mod test {
     }
 
     #[tokio::test]
-    #[ignore]
     async fn test_delete_url() {
         let resp = UdpCoAPClient::delete("coap://coap.me:5683/validate")
             .await
@@ -1170,7 +1163,6 @@ mod test {
     }
 
     #[tokio::test]
-    #[ignore]
     async fn test_delete() {
         let domain = "coap.me";
         let client = UdpCoAPClient::new_udp((domain, 5683)).await.unwrap();
@@ -1216,7 +1208,6 @@ mod test {
         client.send_all_coap(&request, 0).await.unwrap();
     }
     #[tokio::test]
-    #[ignore]
     async fn test_change_block_option() {
         // this test is a little finnicky because it relies on the configuration
         // of the reception endpoint. It tries to send a payload larger than the