Merge pull request #699 from microsoftgraph/bugfix/generic-type-warning

- fixes a bug where clients would get a warning because of a missing generic type

Author: baywet

src/main/java/com/microsoft/graph/requests/GraphServiceClient.java

@@ -190,7 +190,7 @@ public Builder<httpClientType, nativeRequestType> serializer(@Nonnull final ISer
          */
         @Nonnull
         @Override
-        public Builder<httpClientType, nativeRequestType> httpProvider(@Nonnull final IHttpProvider httpProvider) {
+        public Builder<httpClientType, nativeRequestType> httpProvider(@Nonnull final IHttpProvider<nativeRequestType> httpProvider) {
             super.httpProvider(httpProvider);
             return this;
         }
@@ -245,8 +245,8 @@ public Builder<httpClientType, nativeRequestType> authenticationProvider(@Nonnul
          */
         @Nonnull
         @Override
-        public GraphServiceClient buildClient() throws ClientException {
-            return buildClient(new GraphServiceClient());
+        public GraphServiceClient<nativeRequestType> buildClient() throws ClientException {
+            return buildClient(new GraphServiceClient<>());
         }
     }