yarn seems impossible for now

.travis.yml

@@ -11,17 +11,16 @@ before_install:
 - docker run -d -p 9200:9200 -p 9300:9300 elasticsearch:2
 - docker run -d -p 5671:5671 -p 5672:5672 -p 25672:25672 rabbitmq:3
 - docker ps -a
-- npm install -g yarn
 install:
-- yarn install
+- npm install
 script:
-- yarn run check
-- yarn build
-- yarn validate
+- npm run check
+- npm run build
+- npm run validate
 after_success:
-- yarn coveralls
+- npm run coveralls
 deploy:
-  provider: yarn
+  provider: npm
   email: panthro.rafael@gmail.com
   api_key:
     secure: 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

package.json

@@ -22,14 +22,14 @@
     "start": "export NODE_ENV=development|| set NODE_ENV=development&& babel-node --presets es2015 src/server.js",
     "audit": "nsp check package",
     "build": "babel -d ./out ./src",
-    "check": "yarn audit && yarn outdated --depth 0",
-    "coverage": "nyc --reporter=lcov --reporter=text --reporter=html yarn test",
-    "coveralls": "yarn coverage && cat ./coverage/lcov.info | coveralls && rm -rf ./coverage",
+    "check": "npm run audit && npm outdated --depth 0",
+    "coverage": "nyc --reporter=lcov --reporter=text --reporter=html npm test",
+    "coveralls": "npm run coverage && cat ./coverage/lcov.info | coveralls && rm -rf ./coverage",
     "lint": "eslint src test",
     "test": "NODE_ENV=test mocha --compilers js:babel-core/register",
-    "validate": "yarn lint && yarn test",
-    "prepare": "yarn build && yarn validate && yarn run check",
-    "pp": "yarn prepare",
+    "validate": "npm run lint && npm test",
+    "prepare": "npm run build && npm run validate && npm run check",
+    "pp": "npm run prepare",
     "major": "pmm major",
     "minor": "pmm minor",
     "patch": "pmm patch"