### readFileLines

Returns an array of lines from the specified file.

Use `readFileSync` function in `fs` node package to create a `Buffer` from a file.
convert buffer to string using `toString(encoding)` function.
creating an array from contents of file by `split`ing file content line by line (each `\n`).

  ```js
const fs = require('fs');
const readFileLines = filename => fs.readFileSync(filename).toString('UTF8').split('\n');
```

```js
contents of test.txt :
  line1
  line2
  line3
  ___________________________
let arr = readFileLines('test.txt')
console.log(arr) // // ['line1', 'line2', 'line3']
```