Example code and update readme.md

.env.example

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+REDE_PV=
+REDE_TOKEN=

.eslintrc.js

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+module.exports = {
+  env: {
+    commonjs: true,
+    es6: true,
+    node: true
+  },
+  extends: ['airbnb-base', 'prettier'],
+  plugins: ['eslint-plugin-prettier'],
+  parser: 'babel-eslint',
+  globals: {
+    Atomics: 'readonly',
+    SharedArrayBuffer: 'readonly'
+  },
+  parserOptions: {
+    ecmaVersion: 2018
+  },
+  rules: {
+    'no-undef': 'off',
+    'new-cap': 'off'
+  }
+}

.gitignore

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 .idea
 node_modules/
 package-lock.json
+yarn.lock
+.env.test
+
+__tests__/coverage

.prettierrc

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+{
+  "singleQuote": true,
+  "trailingComma": "es5"
+}

.travis.yml

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+language: node_js
+node_js:
+  - 8
+  - 10
+  - 11
+  - 12
+
+env:
+  - REDE_PV=10004605 REDE_TOKEN=a53ecd5be25c4069b2a21b004b9c4872
+
+cache:
+  npm: false
+  yarn: true
+
+before_install:
+  - curl -o- -L https://yarnpkg.com/install.sh | bash -s
+  - export PATH="$HOME/.yarn/bin:$PATH"
+
+script:
+  - yarn install
+  - yarn test