log_string v1.0.0

How to use this module

```
    var demo = require('log_string');
    demo([2, 3, 4, 5, 6, 7]);
```
----
```
    Output should be [2, 2, 3, 3, 4, 4];
```
---

this is the end. this module is very easy to build because this is for testing the first time created the npm module.