consul-client: Do not set http2_prior_knowledge (#381)

* consul-client: Do not set http2_prior_knowledge

reqwest will use HTTP/2 unless `http1_only` is set. Setting
`http2_prior_knowledge` only causes it to not even attempt other HTTP
versions.

* Also remove http1_only

Author: PeterCxy

crates/consul-client/src/lib.rs

@@ -65,10 +65,9 @@ impl Client {
 
             reqwest::ClientBuilder::new()
                 .use_preconfigured_tls(tls_config)
-                .http2_prior_knowledge()
                 .build()
         } else {
-            reqwest::ClientBuilder::new().http1_only().build()
+            reqwest::ClientBuilder::new().build()
         };
 
         Ok(Self {