Fix export error messages encoding

Author: Simon Bihel

ftplugin/orgmode/plugins/Export.py

@@ -81,7 +81,7 @@ def _export(cls, format_):
 		p.wait()
 
 		if p.returncode != 0 or settings.get(u'org_export_verbose') == 1:
-			echom('\n'.join(p.communicate()))
+			echom('\n'.join(map(lambda x: x.decode(), p.communicate())))
 		return p.returncode
 
 	@classmethod