Add ability to create a new WebPushClient from a custom Isahc/hyper c…

…lient (#56)

src/clients/hyper_client.rs

@@ -25,6 +25,13 @@ impl Default for HyperWebPushClient {
     }
 }
 
+impl From<Client<HttpsConnector<HttpConnector>>> for HyperWebPushClient {
+    /// Creates a new client from a custom hyper HTTP client.
+    fn from(client: Client<HttpsConnector<HttpConnector>>) -> Self {
+        Self { client }
+    }
+}
+
 impl HyperWebPushClient {
     /// Creates a new client.
     pub fn new() -> Self {

src/clients/isahc_client.rs

@@ -26,6 +26,13 @@ impl Default for IsahcWebPushClient {
     }
 }
 
+impl From<HttpClient> for IsahcWebPushClient {
+    /// Creates a new client from a custom Isahc HTTP client.
+    fn from(client: HttpClient) -> Self {
+        Self { client }
+    }
+}
+
 impl IsahcWebPushClient {
     /// Creates a new client. Can fail under resource depletion.
     pub fn new() -> Result<Self, WebPushError> {