title: PyPDF2 can't read non-English characters, returns empty string on extractText()
body: <p>i'm working on a script that will extract data from a large <strong>PDF File (40-60 plus, pages long)</strong>
  that <strong>isn't in English</strong> but the file contains <strong>Greek characters</strong> and all seems good until i run the <code>extractText()</code> function of <strong>PyPDF2</strong> to get the givens page contents, then it returns an empty string.</p>
  
  <p>I'm new to this library and i don't know what to do, to fix this problem!!</p>