Merge pull request #85 from asquare14/fix-equality

(bugsbash)fixes strings should not be compared with '=='

Author: tsurdilo

diagram/src/main/java/io/serverlessworkflow/diagram/model/ModelConnection.java

@@ -33,9 +33,9 @@ public ModelConnection(String left, String right, String desc) {
     public String toString() {
         StringBuffer retBuff = new StringBuffer();
         retBuff.append(System.lineSeparator());
-        retBuff.append(left == WorkflowDiagramUtils.wfStart ? WorkflowDiagramUtils.startEnd : left);
+        retBuff.append(left.equals(WorkflowDiagramUtils.wfStart) ? WorkflowDiagramUtils.startEnd : left);
         retBuff.append(WorkflowDiagramUtils.connection);
-        retBuff.append(right == WorkflowDiagramUtils.wfEnd ? WorkflowDiagramUtils.startEnd : right);
+        retBuff.append(right.equals(WorkflowDiagramUtils.wfEnd) ? WorkflowDiagramUtils.startEnd : right);
         if (desc != null && desc.trim().length() > 0) {
             retBuff.append(WorkflowDiagramUtils.description).append(desc);
         }