title: Github Search API filename only returns 1 result
body: <p>I'm trying to search for all projects (or at least several thousand) from the github search API. I've gotten everything else to work, except the filters on filename.</p>
  
  <p>For example, sending the following request to the search API only returns 1 result:</p>
  
  <pre><code>https://api.github.com/search/code?q=django+in:requirements.txt+filename:requirements.txt+language:python+org:openmicroscopy
  </code></pre>
  
  <p>Likewise, sending the following </p>
  
  <pre><code>https://api.github.com/search/repositories?q=filename:Makefile&amp;per_page=100
  </code></pre>
  
  <p>only returns 1 result as well. I'm willing to bet that there is more than 1 repo on github with a Makefile or a dependency on Django. I must be doing something wrong, but I can't seem to figure out what it is.</p>