[Feat][SDK-348] Add uncaught exception to payload (#319)

* test: expect is_uncaught field in data

* feat(payload): add is_uncaught field in data

Author: christianbuon

rollbar-api/src/main/java/com/rollbar/api/payload/data/Data.java

@@ -309,6 +309,8 @@ public Map<String, Object> asJson() {
       values.put("notifier", notifier);
     }
 
+    values.put("is_uncaught", isUncaught);
+
     return values;
   }
 

rollbar-api/src/test/java/com/rollbar/api/payload/data/DataTest.java

@@ -80,6 +80,8 @@ public void shouldReturnAsJson() {
       expected.put("notifier", data.getNotifier());
     }
 
+    expected.put("is_uncaught", data.isUncaught());
+    
     assertThat(data.asJson(), is(expected));
   }
 }