add nodemon & fix dbstart script

package.json

@@ -8,7 +8,7 @@
     "build-docker-dev": "source .env.development && docker-compose build",
     "lint": "vue-cli-service lint",
     "appserver": "node app-server/app-server.js",
-    "dbtest": "source .env.development && cd tests/db && docker-compose start",
+    "dbtest": "source .env.development && cd tests/db && docker-compose up",
     "build-dev": "source .env.development && vue-cli-service build --mode development",
     "dev": "source .env.development && vue-cli-service serve --open",
     "server": "source .env.production && cd server && npm start",
@@ -46,6 +46,7 @@
     "jsdoc-vuejs": "^3.0.8",
     "jsdoc-vuex-plugin": "^1.0.0",
     "node-sass": "^4.12.0",
+    "nodemon": "^2.0.7",
     "prettier": "^1.19.1",
     "sass-loader": "^8.0.2",
     "style-resources-loader": "^1.3.2",