Add tslint rule to prevent import from out

Fixes #1996

package.json

@@ -11,7 +11,7 @@
     "prepackage": "npm run build",
     "package": "webpack",
     "start": "node demo/start",
-    "lint": "tslint 'src/**/*.ts' './demo/**/*.ts' './addons/**/*.ts'",
+    "lint": "tslint 'src/**/*.ts' 'addons/**/*.ts'",
     "test": "npm run test-unit",
     "posttest": "npm run lint",
     "test-api": "mocha \"**/*.api.js\"",
@@ -45,7 +45,7 @@
     "puppeteer": "^1.15.0",
     "source-map-loader": "^0.2.4",
     "ts-loader": "^4.5.0",
-    "tslint": "^5.9.1",
+    "tslint": "^5.18.0",
     "tslint-consistent-codestyle": "^1.13.0",
     "typescript": "3.5",
     "utf8": "^3.0.0",