update common files

Author: masters3d

exercises/two-bucket/package.json

@@ -15,12 +15,12 @@
     "lintci": "tslint \"*.ts?(x)\" --force"
   },
   "dependencies": {
-    "@types/jest": "^20.0.0",
-    "@types/node": "^7.0.5",
-    "jest": "^20.0.4",
-    "ts-jest": "^20.0.6",
-    "tslint": "^5.4.3",
-    "typescript": "^2.2.1"
+    "@types/jest": "^21.1.5",
+    "@types/node": "^8.0.47",
+    "jest": "^21.2.1",
+    "ts-jest": "^21.1.3",
+    "tslint": "^5.8.0",
+    "typescript": "^2.5.3"
   },
   "jest": {
     "transform": {