MidPoint
=====
Find the midpoint of a line.
```
npm install midpoint
```
to use
```js
midPoint([[0,0], [1,1], [2,2]]);// -> returns [1, 1]
midPoint([[0,0], [1,1], [2,2], [3,3]]);// -> returns [1.5, 1.5]
midPoint([[0,0], [1,1], [3,3]]);// -> returns [1.5, 1.5]
```