message: Update travis-browsers.json
  Test Edge 15 and 17, Safari 9, 10, 11, and Chrome 41
diff: {
  "browserName": "microsoftedge",
  "platform": "Windows 10",
  - "version": "14"
  + "version": "15"
  },
  {
  "browserName": "microsoftedge",
  "platform": "Windows 10",
  - "version": "15"
  + "version": "17"
  },
  {
  "browserName": "internet explorer",
  },
  {
  "browserName": "safari",
  - "platform": "OS X 10.12",
  + "platform": "macos 10.13",
  "version": "11"
  },
  {
  "browserName": "safari",
  - "platform": "OS X 10.11",
  + "platform": "OS X 10.12",
  "version": "10"
  },
  {
  "browserName": "safari",
  "platform": "OS X 10.11",
  "version": "9"
  + },
  + {
  + "browserName": "chrome",
  + "platform": "Linux",
  + "version": "41"
  }
  ]
  