title: UnexpectedValueException Could not parse version constraint when trying to instal laravelcollective
body: <p>I am new to laravel and I am trying to install <em>laravelcollective</em>. I am just following to documentation <a href="https://laravelcollective.com/docs/5.4/html" rel="noreferrer">here</a> and I am using this from my project directory: </p>
  
  <p><code>composer require "laravelcollective/html":"^5.4.0"</code></p>
  
  <p>Unfortunately, immediately after I press ented I get the following error : </p>
  
  <blockquote>
    <p>[UnexpectedValueException]
      Could not parse version constraint :5.4.0: Invalid version string ":5.4.0"</p>
  </blockquote>
  
  <p>I just don't know how to troubleshoot this. I didn't find much on google and this combined with my lack of experience with laravel leaves me stuck. </p>
  
  <p>Can someone help?</p>