Upgrade to nestjs v6 (#2)

* add tasks mangement

* add database support and security

* add validation decorators

* Delete db.txt

* remove toPromise

* upgrade to nestjs v6

server/package.json

@@ -25,39 +25,37 @@
     "test:e2e": "jest --config ./test/jest-e2e.json"
   },
   "dependencies": {
-    "@nestjs/common": "^5.4.0",
-    "@nestjs/core": "^5.4.0",
-    "@nestjs/typeorm": "^5.3.0",
-    "class-transformer": "^0.2.0",
-    "class-validator": "^0.9.1",
-    "dotenv": "^6.2.0",
-    "mysql": "^2.14.1",
-    "pg": "^7.8.1",
-    "reflect-metadata": "^0.1.10",
-    "rimraf": "^2.6.2",
-    "rxjs": "^6.2.2",
-    "typeorm": "0.2.14",
-    "typescript": "^3.0.1",
-    "uuid": "^3.3.2"
+    "@nestjs/common": "6.1.0",
+    "@nestjs/core": "6.1.0",
+    "@nestjs/platform-express": "6.1.0",
+    "@nestjs/typeorm": "6.0.0",
+    "class-transformer": "0.2.0",
+    "class-validator": "0.9.1",
+    "dotenv": "7.0.0",
+    "pg": "7.9.0",
+    "reflect-metadata": "0.1.13",
+    "rxjs": "6.4.0",
+    "typeorm": "0.2.16",
+    "uuid": "3.3.2"
   },
   "devDependencies": {
-    "@nestjs/testing": "^5.1.0",
-    "@types/dotenv": "^6.1.0",
-    "@types/express": "^4.16.0",
-    "@types/jest": "^23.3.1",
-    "@types/node": "^8.0.29",
-    "@types/supertest": "^2.0.5",
-    "@types/uuid": "^3.4.4",
+    "@nestjs/testing": "6.1.0",
+    "@types/dotenv": "6.1.1",
+    "@types/express": "4.16.1",
+    "@types/jest": "24.0.11",
+    "@types/node": "10.14.4",
+    "@types/supertest": "2.0.7",
+    "@types/uuid": "3.4.4",
     "jest": "^23.5.0",
-    "nodemon": "^1.18.3",
-    "prettier": "^1.14.2",
+    "nodemon": "1.18.11",
+    "prettier": "1.17.0",
     "supertest": "^3.1.0",
     "ts-jest": "^23.1.3",
-    "ts-loader": "^4.4.2",
-    "ts-node": "^8.0.2",
-    "tsconfig-paths": "^3.5.0",
-    "tslint": "5.11.0",
-    "typescript": "2.5.2"
+    "ts-loader": "5.3.3",
+    "ts-node": "8.0.3",
+    "tsconfig-paths": "3.8.0",
+    "tslint": "5.15.0",
+    "typescript": "3.4.3"
   },
   "jest": {
     "moduleFileExtensions": [