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",