message: Update node host version
diff: {
  "name": "@fluid-example/node-host",
  - "version": "0.19.0",
  + "version": "0.20.0",
  "private": true,
  "description": "Fluid container host for Node.js environment",
  "repository": "microsoft/FluidFramework",
  "tsc": "tsc"
  },
  "dependencies": {
  - "@fluid-example/key-value-cache": "^0.19.0",
  - "@fluidframework/component-core-interfaces": "^0.19.0",
  - "@fluidframework/container-definitions": "^0.19.0",
  - "@fluidframework/container-loader": "^0.19.0",
  - "@fluidframework/driver-definitions": "^0.19.0",
  + "@fluid-example/key-value-cache": "^0.20.0",
  + "@fluidframework/component-core-interfaces": "^0.20.0",
  + "@fluidframework/container-definitions": "^0.20.0",
  + "@fluidframework/container-loader": "^0.20.0",
  + "@fluidframework/driver-definitions": "^0.20.0",
  "@fluidframework/protocol-definitions": "^0.1006.1",
  - "@fluidframework/routerlicious-driver": "^0.19.0",
  - "@fluidframework/routerlicious-host": "^0.19.0",
  + "@fluidframework/routerlicious-driver": "^0.20.0",
  + "@fluidframework/routerlicious-host": "^0.20.0",
  "jsonwebtoken": "^8.4.0",
  "uuid": "^3.3.2"
  },
  