build: upgrade deps

Author: balazs4

package.json

@@ -13,16 +13,16 @@
     "test": "jest --coverage"
   },
   "dependencies": {
-    "debug": "^2.6.6",
+    "debug": "^3.1.0",
     "flat-file-db": "^1.0.0",
-    "koa": "^2.2.0",
+    "koa": "^2.4.1",
     "koa-bodyparser": "^4.2.0",
     "koa-path-match": "^2.0.0",
-    "uuid": "^3.0.1"
+    "uuid": "^3.1.0"
   },
   "devDependencies": {
-    "jest": "^20.0.0",
-    "request-promise-native": "^1.0.4"
+    "jest": "^22.0.4",
+    "request-promise-native": "^1.0.5"
   },
   "repository": {
     "type": "git",