Document the wxPython 3.x version requirement

JorjMcKie · JorjMcKie · commit 02dd50da29e6 · 2015-08-08T04:10:11.000-04:30
diff --git a/examples/PDF_Joiner.py b/examples/PDF_Joiner.py
@@ -15,6 +15,7 @@
 * Optional rotation in steps of 90 degrees
 * Copying any table of contents to the output
 
+Please note that you need wxPython version of 3.x
 """
 
 import os
