Issue #21: Resolve module dependency issues

Signed-off-by: Lucas Fernandes de Oliveira <lfo14@inf.ufpr.br>

package.json

@@ -23,13 +23,13 @@
     "@types/express": "^4.0.33",
     "@types/js-yaml": "^3.5.29",
     "@types/pg": "^6.1.38",
-    "async": "^2.3.0",
+    "async": "=2.4.1",
     "express": "^4.0.33",
     "js-yaml": "^3.8.2",
     "osprey": "^0.3.2",
     "pg": "^6.1.5",
-    "ts-node": "^1.3.0",
-    "typescript": "^2.0.3"
+    "ts-node": "^3.1.0",
+    "typescript": "^2.4.1"
   },
   "devDependencies": {
     "@types/mocha": "^2.2.32",