Updated composer install instructions

Avoids suggesting people install with `*` which is kinda dangerous, and still installs the latest version to their `composer.json`.
It's not pro it's just pointlessly verbose and offers no benefit whatsoever, but you're welcome to do as you wish. :)   

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On 21 October 2014 18:46:27 GMT-4, 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   yes, manual put to the composer.json is kind of for pro, when you control what are you do as well understand what is happen, instead of just user composer require  for lazy or just as fast install   —Reply to this email directly or view it on GitHub.  {"@context":"http://schema.org","@type":"EmailMessage","description":"View this Pull Request on GitHub","action":{"@type":"ViewAction","url":"https://github.com/KnpLabs/snappy/pull/118/files#r19184803","name":"View Pull Request"}}