Typos in readme for install and sample code

[colin-brown]

The installation instructions use the package name string-comparision but the actual package name is string-comparison

To install the instructions should read:

npm install string-comparison --save

The sample code has a line which should be commented out:

// use Consine

..and the method name has a typo, it should be cosine not consine. Correct line should be:

let cos = stringComparision.cosine

[Rabbitzzc]

thks...