Fix dependency to only allow codemirror 5.

package.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "@ambers/contrib-web": ">=0.7.3",
     "@ambers/lang": ">=0.26.0",
-    "codemirror": ">=5.44.0",
+    "codemirror": "^5.44.0",
     "jquery-ui-dist": ">=1.9.2",
     "require-css": "^0.1.10"
   },