remove async to httpSend in sendfile

Author: addee1

src/main/java/com/example/NtfyConnectionImpl.java

@@ -89,7 +89,7 @@ public boolean sendFile(File file){
                     .PUT(HttpRequest.BodyPublishers.ofFile(file.toPath()))
                     .build();
 
-            http.sendAsync(request, HttpResponse.BodyHandlers.discarding());
+            http.send(request, HttpResponse.BodyHandlers.discarding());
             return true;
 
         } catch (Exception e) {