Fix attachments

Author: stefanius

src/main/java/com/testmonitor/resources/TestResult.java

@@ -119,7 +119,7 @@ public void addAttachment(File attachment) {
 
     public HashMap<String, File> getAttachments() {
         return new HashMap<String, File>() {{
-            attachments.forEach((file) -> put("file", file));
+            attachments.forEach((file) -> put("attachments[]", file));
         }};
     }