title: composer asking oauth token for download public repo
body: <p>My PHP project has a dependency on a nice library <a href="https://github.com/nilportugues/php-sql-query-builder" rel="noreferrer">php-sql-query-builder</a>. However, this library has a bug. So I fork the library from it github source to my github account at <a href="https://github.com/mmuhasan/php-sql-query-builder" rel="noreferrer">https://github.com/mmuhasan/php-sql-query-builder</a> and fix the bug in a branch named "<a href="https://github.com/mmuhasan/php-sql-query-builder/tree/dev-where-bug-fix" rel="noreferrer">dev-where-bug-fix</a>". Then I updated my my project composer file as following:</p>
  
  <pre><code>....
  "repositories": [
      {
          "type": "vcs",
          "url": "https://github.com/mmuhasan/php-sql-query-builder"
      }
  ],
  "require":{
      "nilportugues/sql-query-builder" : "dev-where-bug-fix"
  },
  ....
  </code></pre>
  
  <p>When I run <code>composer update</code> it ask for a oAuth token as follows:</p>
  
  <pre><code>Could not fetch https://api.github.com/repos/mmuhasan/php-sql-query-builder/contents/composer.json?ref=3dca30b0eaee835783fa61286a51dda425cd3838, please create a GitHub OAuth token to go over the API rate limit
  Head to https://github.com/settings/tokens/new?scopes=repo&amp;description=Composer+on+LAPTOP-056S12EK+2018-03-27+1845 to retrieve a token. 
  </code></pre>
  
  <p>Since my fork is in public, and I want it to be public, why composer is asking token. Any help will be very much appreciated. </p>