Merge pull request nestjs#1168 from jbpionnier/build/add_lint_travis_builds

chore(build) add lint for travis build

Author: kamilmysliwiec

.travis.yml

@@ -19,5 +19,6 @@ install:
   - npm ci
   - gulp build
 script:
+  - npm run lint
   - npm test
 after_success: npm run coverage

packages/core/injector/module-token-factory.ts

@@ -2,7 +2,7 @@ import { DynamicModule } from '@nestjs/common';
 import { SHARED_MODULE_METADATA } from '@nestjs/common/constants';
 import { Type } from '@nestjs/common/interfaces/type.interface';
 import * as hash from 'object-hash';
-import safeStringify from 'fast-safe-stringify';
+import stringify from 'fast-safe-stringify';
 
 export class ModuleTokenFactory {
   public create(
@@ -25,7 +25,7 @@ export class ModuleTokenFactory {
   ): string {
     // Uses safeStringify instead of JSON.stringify
     // to support circular dynamic modules
-    return dynamicModuleMetadata ? safeStringify(dynamicModuleMetadata) : '';
+    return dynamicModuleMetadata ? stringify(dynamicModuleMetadata) : '';
   }
 
   public getModuleName(metatype: Type<any>): string {