Restore client creation backwards-compatibility

Only provide RestClient::new and new_blocking for
RestClient<GaiResolver>

Author: AquilaIrreale

src/lib.rs

@@ -306,26 +306,32 @@ pub trait RestPath<T> {
     fn get_path(par: T) -> Result<String, Error>;
 }
 
-impl<R> RestClient<R>
-where
-    R: Service<dns::Name> + Send + Sync + Default + Clone + 'static,
-    HttpsConnector<HttpConnector<R>>: hyper::client::connect::Connect,
-{
-    /// Construct new client with default configuration to make HTTP requests.
+impl RestClient<GaiResolver> {
+    /// Construct new client with default configuration and DNS resolver
+    /// implementation to make HTTP requests.
     ///
-    /// Use `Builder` to configure the client.
-    pub fn new(url: &str) -> Result<RestClient<R>, Error> {
-        RestClient::<R>::with_builder(url, Self::builder())
+    /// Use `Builder` to configure the client or to use a different
+    /// resolver type.
+    pub fn new(url: &str) -> Result<RestClient<GaiResolver>, Error> {
+        RestClient::with_builder(url, Self::builder())
     }
 
-    /// Construct new blocking client with default configuration to make HTTP requests.
+    /// Construct new blocking client with default configuration and DNS resolver
+    /// implementation to make HTTP requests.
     ///
-    /// Use `Builder` to configure the client.
+    /// Use `Builder` to configure the client or to use a different
+    /// resolver type.
     #[cfg(feature = "blocking")]
-    pub fn new_blocking(url: &str) -> Result<blocking::RestClient<R>, Error> {
+    pub fn new_blocking(url: &str) -> Result<blocking::RestClient<GaiResolver>, Error> {
         RestClient::new(url).and_then(|client| client.try_into())
     }
+}
 
+impl<R> RestClient<R>
+where
+    R: Service<dns::Name> + Send + Sync + Default + Clone + 'static,
+    HttpsConnector<HttpConnector<R>>: hyper::client::connect::Connect,
+{
     #[cfg(feature = "native-tls")]
     fn build_client() -> HyperClient<R>
     {