make Configuration.init with HTTPVersion internal

Author: dnadoba

Diff for: Sources/AsyncHTTPClient/HTTPClient.swift

@@ -626,7 +626,7 @@ public class HTTPClient {
             )
         }
 
-        public init(
+        internal init(
             tlsConfiguration: TLSConfiguration? = nil,
             redirectConfiguration: RedirectConfiguration? = nil,
             timeout: Timeout = Timeout(),

Diff for: Tests/AsyncHTTPClientTests/HTTP2ClientTests.swift

@@ -26,12 +26,12 @@ class HTTP2ClientTests: XCTestCase {
     func makeDefaultHTTPClient() -> HTTPClient {
         var tlsConfig = TLSConfiguration.makeClientConfiguration()
         tlsConfig.certificateVerification = .none
+        var config = HTTPClient.Configuration()
+        config.tlsConfiguration = tlsConfig
+        config.httpVersion = .automatic
         return HTTPClient(
             eventLoopGroupProvider: .createNew,
-            configuration: HTTPClient.Configuration(
-                tlsConfiguration: tlsConfig,
-                httpVersion: .automatic
-            ),
+            configuration: config,
             backgroundActivityLogger: Logger(label: "HTTPClient", factory: StreamLogHandler.standardOutput(label:))
         )
     }
@@ -124,12 +124,12 @@ class HTTP2ClientTests: XCTestCase {
         let elg = MultiThreadedEventLoopGroup(numberOfThreads: numberOfWorkers)
         var tlsConfig = TLSConfiguration.makeClientConfiguration()
         tlsConfig.certificateVerification = .none
+        var config = HTTPClient.Configuration()
+        config.tlsConfiguration = tlsConfig
+        config.httpVersion = .automatic
         let localClient = HTTPClient(
             eventLoopGroupProvider: .shared(elg),
-            configuration: HTTPClient.Configuration(
-                tlsConfiguration: tlsConfig,
-                httpVersion: .automatic
-            ),
+            configuration: config,
             backgroundActivityLogger: Logger(label: "HTTPClient", factory: StreamLogHandler.standardOutput(label:))
         )
         defer {