too many grammer mistakes-_-

Author: wanglongqi

README.md

@@ -13,7 +13,7 @@ Just drop `writetex.py` and `writetex.inx` to Inkscape extension folder, which i
 For ease of the users, I also provide unofficial PDFTOSVG binaries for Windows and Mac OSX users. 
 
 - For **Windows** user, binary version of *pdf2svg* is provided.
-- For **Mac OSX** user, binary version of *pstoedit* and *pdf2svg* is provided.
+- For **Mac OSX** user, binary version of both *pstoedit* and *pdf2svg* are provided.
 - For **Linux** and other OS, *pdf2svg* or *pstoedit* usually can be installed from default package manager.
 
 ## Usage