message: Use Vega 3 as peer dependency
diff: "uglify-es": "^3.0.27",
  "watchify": "^3.9.0"
  },
  + "peerDependencies": {
  + "vega": "^3.0.0"
  + },
  "dependencies": {
  - "vega": "^3.0.0-rc5",
  - "vega-lite": "^2.0.0-beta.11",
  + "vega-lite": "^2.0.0-beta.13",
  "compare-versions": "^3.0.1",
  "d3-selection": "^1.1.0",
  "vega-schema-url-parser": "^1.0.0-beta.2"
  