Updated composer install instructions

Avoids suggesting people install with `*` which is kinda dangerous, and still installs the latest version to their `composer.json`.
Maybe, but then you’d have to keep updating the version number inside `"knplabs/knp-snappy": “~1.1”` as you release new versions.

This is the recommended solution to install, and there is no benefit to manually copying and pasting bits in. :)

-- 
Phil

On October 21, 2014 at 5:12:03 PM, Alex Demchenko (notifications@github.com) wrote:

In README.markdown:

> @@ -10,14 +10,8 @@ You will have to download wkhtmltopdf `0.12.x` in order to use Snappy.
>   
>  ## Installation using [Composer](http://getcomposer.org/)
>   
> -Add to your `composer.json`:
> -
> -```json
> -{
> -    "require" :  {
> -        "knplabs/knp-snappy": "*"
> -    }
> -}
> +```bash
this is good, better to not remove above, but add it as alternative, like:

Add to your composer.json:
...

or

$ composer require knplabs/knp-snappy

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