Use Prettier instead of TSLint

What we need with TS is a formatter, not a linter.

Author: Hyunje Jun

package-lock.json

@@ -18,9 +18,11 @@
   "scripts": {
     "pretest": "npm run build",
     "test": "API_BASE_URL=http://localhost:1234/ TEST_PORT=1234 mocha -r ts-node/register test/*.spec.ts",
-    "lint": "tslint '{lib,test}/**/*.ts'",
+    "prettier": "prettier --parser typescript --trailing-comma all '{lib,test}/**/*.ts'",
+    "format": "npm run prettier -- --write",
+    "format:check": "npm run prettier -- -l",
     "clean": "del-cli dist",
-    "prebuild": "npm run lint && npm run clean",
+    "prebuild": "npm run format:check && npm run clean",
     "build": "tsc",
     "docs": "gitbook install && gitbook serve docs",
     "docs:publish": "./docs/publish.sh",
@@ -48,8 +50,8 @@
     "express": "^4.15.3",
     "gitbook-cli": "^2.3.0",
     "mocha": "^3.4.2",
+    "prettier": "^1.7.4",
     "ts-node": "^3.0.6",
-    "tslint": "^5.4.3",
     "typescript": "^2.3.4"
   },
   "license": "Apache-2.0"