chore(project): bump diagram-js dependency

* corrects error on connection hover

package-lock.json

@@ -1865,9 +1865,9 @@
       "dev": true
     },
     "diagram-js": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/diagram-js/-/diagram-js-0.28.0.tgz",
-      "integrity": "sha512-aS/hbQrNWMqoIYJqi06FkaMvj7edH+xj625NPgxpvpZY2jFRHjGSKViwNIpBCVK0QfQAWdQNr8xfddoJax903w==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/diagram-js/-/diagram-js-0.28.1.tgz",
+      "integrity": "sha512-dhT0ZiH0B5uREphnApWaR92J/KClfbeDaAx+vLenOqXwYmPJIu6kz6Sjm0C/A7OlB8rPBHY6meyJdb5jdJKqJQ==",
       "requires": {
         "didi": "0.1.1",
         "hammerjs": "2.0.8",

package.json

@@ -79,7 +79,7 @@
   "dependencies": {
     "bpmn-font": "^0.8.0",
     "bpmn-moddle": "^2.1.0",
-    "diagram-js": "^0.28.0",
+    "diagram-js": "^0.28.1",
     "diagram-js-direct-editing": "^0.22.0",
     "ids": "^0.2.0",
     "inherits": "^2.0.1",