chore(package): update jest to ^23.4.2

Author: medfreeman

package.json

@@ -47,7 +47,7 @@
     "eslint-plugin-jest": "^21.1.0",
     "git-exec-and-restage": "^1.0.1",
     "husky": "^0.14.3",
-    "jest": "^22.0.4",
+    "jest": "^23.4.2",
     "koa": "^2.3.0",
     "koa-static": "^5.0.0",
     "lint-staged": "^7.0.1",
@@ -83,7 +83,6 @@
   "jest": {
     "testEnvironment": "node",
     "coverageDirectory": "./coverage/",
-    "mapCoverage": true,
     "collectCoverage": true
   },
   "eslintConfig": {