test against latest pyexcel

Author: chfw

README.rst

@@ -182,4 +182,5 @@ Support the project
 ================================================================================
 
 If your company has embedded pyexcel and its components into a revenue generating
-product, please `support me on patreon <https://www.patreon.com/pyexcel>`_.
+product, please `support me on patreon <https://www.patreon.com/pyexcel>`_ to
+maintain the project and develop it further.

rnd_requirements.txt

@@ -1,5 +1,5 @@
 https://github.com/pyexcel/pyexcel/archive/master.zip
-https://github.com/pyexcel/pyexcel-io/archive/master.zip
-https://github.com/pyexcel/pyexcel-xls/archive/master.zip
+https://github.com/pyexcel/pyexcel-io/archive/v0.4.x.zip
+https://github.com/pyexcel/pyexcel-xls/archive/v0.4.x.zip