Edited comment about base64

Author: ZerdaH

README.md

@@ -1,7 +1,7 @@
 DOCX.js
 =======
 
-DOCX.js is a JavaScript library for converting the data in base64 DOCX files into HTML - and back! Please note that this library is licensed under the Microsoft Office Extensible File License - a license NOT approved by the OSI. While this license is based off of the MS-PL, which is OSI-approved, there are significant differences.
+DOCX.js is a JavaScript library for converting the data in binary DOCX files into HTML - and back! Please note that this library is licensed under the Microsoft Office Extensible File License - a license NOT approved by the OSI. While this license is based off of the MS-PL, which is OSI-approved, there are significant differences.
 
 DOCX.js depends on [JSZip](https://github.com/Stuk/jszip)