fix(config): move puppeteer from dependency to dev-dependency (#3193)

Fixes #3191 Thanks to @davidshepherd7 for suggesting this.

Author: johnjbarton

package.json

@@ -388,7 +388,6 @@
  "mime": "^2.3.1",
  "minimatch": "^3.0.2",
  "optimist": "^0.6.1",
- "puppeteer": "^1.9.0",
  "qjobs": "^1.1.4",
  "range-parser": "^1.2.0",
  "rimraf": "^2.6.0",
@@ -455,6 +454,7 @@
  "mocha": "^4.0.1",
  "mocks": "^0.0.15",
  "proxyquire": "^1.7.11",
+ "puppeteer": "^1.9.0",
  "qunitjs": "^2.1.1",
  "requirejs": "^2.1.20",
  "sinon": "^6.1.5",