#183: Bug: Modal doesn't work

* downgrade react to 15.6.1

package.json

@@ -103,11 +103,11 @@
     "passport-local": "^1.0.0",
     "pino-clf": "^1.0.2",
     "plantuml-encoder": "^1.2.4",
-    "react": "^16.0.0",
+    "react": "15.6.1",
     "react-bootstrap": "^0.31.0",
     "react-bootstrap-typeahead": "^1.4.2",
     "react-clipboard.js": "^1.1.2",
-    "react-dom": "^16.0.0",
+    "react-dom": "15.6.1",
     "redis": "^2.7.1",
     "reveal.js": "^3.5.0",
     "rimraf": "^2.6.1",