Don't use query param for the POST requests (#1199)

Author: jmini

Diff for: src/main/java/org/gitlab4j/api/EpicsApi.java

@@ -332,8 +332,7 @@ public Epic createEpic(
                 .withParam("start_date", startDate)
                 .withParam("end_date", endDate)
                 .withParam("created_at", createdAt);
-        Response response =
-                post(Response.Status.CREATED, formData.asMap(), "groups", getGroupIdOrPath(groupIdOrPath), "epics");
+        Response response = post(Response.Status.CREATED, formData, "groups", getGroupIdOrPath(groupIdOrPath), "epics");
         return (response.readEntity(Epic.class));
     }
 
@@ -363,8 +362,7 @@ public Epic createEpic(Object groupIdOrPath, Epic epic) throws GitLabApiExceptio
                 .withParam("start_date", epic.getStartDate())
                 .withParam("end_date", epic.getEndDate())
                 .withParam("created_at", epic.getCreatedAt());
-        Response response =
-                post(Response.Status.CREATED, formData.asMap(), "groups", getGroupIdOrPath(groupIdOrPath), "epics");
+        Response response = post(Response.Status.CREATED, formData, "groups", getGroupIdOrPath(groupIdOrPath), "epics");
         return (response.readEntity(Epic.class));
     }
 

Diff for: src/main/java/org/gitlab4j/api/RunnersApi.java

@@ -530,7 +530,7 @@ public RunnerDetail registerRunner(
                 .withParam("run_untagged", runUntagged, false)
                 .withParam("tag_list", tagList, false)
                 .withParam("maximum_timeout", maximumTimeout, false);
-        Response response = post(Response.Status.CREATED, formData.asMap(), "runners");
+        Response response = post(Response.Status.CREATED, formData, "runners");
         return (response.readEntity(RunnerDetail.class));
     }