Fix jsdoc versions (#513)

Author: strausr

package.json

@@ -63,14 +63,14 @@
     "grunt-contrib-cssmin": "^2.2.1",
     "grunt-contrib-handlebars": "^1.0.0",
     "grunt-contrib-uglify": "^3.3.0",
-    "grunt-jsdoc": "^2.2.0",
+    "grunt-jsdoc": "2.4.1",
     "handlebars": "^4.0.11",
     "handlebars-layouts": "^3.1.4",
     "jest": "^26.0.1",
     "jest-html-reporters": "^1.2.1",
     "jquery": "3.1.1",
-    "jsdoc": "^3.6.4",
-    "jsdoc-plugin-typescript": "^2.0.5",
+    "jsdoc": "3.6.4",
+    "jsdoc-plugin-typescript": "2.0.5",
     "lunr": "^1.0.0",
     "mock-fs": "^4.12.0",
     "moment": "^2.22.1",