Update Travis configuration

.travis.yml

@@ -1,5 +1,4 @@
 language: node_js
-cache: yarn
 
 node_js:
   - 'lts/*'
@@ -23,8 +22,7 @@ deploy:
   provider: npm
   skip_cleanup: true
   email: theaifam5@gmail.com
-  api_key:
-    secure: 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
+  api_key: $NPM_API_KEY
   on:
     tags: true
     repo: TheAifam5/entry-runner-webpack-plugin