chore(package): update espree to version 5.0.0

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
  "chai-spies": "1.0.0",
  "coveralls": "3.0.2",
  "eslint": "5.7.0",
- "espree": "4.1.0",
+ "espree": "5.0.0",
  "gulp": "4.0.0",
  "gulp-eslint": "5.0.0",
  "gulp-istanbul": "1.1.3",