message: add verify-travis-appveyor as test
diff: "rimraf": "^2.6.1",
  "slump": "~2.0.0",
  "tap-spec": "^4.1.1",
  - "tape": "^4.5.1"
  + "tape": "^4.5.1",
  + "verify-travis-appveyor": "^2.0.2"
  },
  "scripts": {
  "install": "prebuild-install || node-gyp rebuild",
  - "test": "tape test/*-test.js | tap-spec && prebuild-ci",
  + "test": "verify-travis-appveyor && tape test/*-test.js | tap-spec && prebuild-ci",
  "rebuild": "prebuild --compile",
  "prebuild": "prebuild -t 8.1.2 -t 6.11.0 -t 4.8.3 -t 7.10.0 --strip --verbose"
  },
  