release(hansbug): use version 1.3.1

Author: HansBug

treevalue/config/meta.py

@@ -7,7 +7,7 @@
 __TITLE__ = "treevalue"
 
 #: Version of this project.
-__VERSION__ = "1.3.0"
+__VERSION__ = "1.3.1"
 
 #: Short description of the project, will be included in ``setup.py``.
 __DESCRIPTION__ = 'A flexible, generalized tree-based data structure.'