release version 3.1.0 to resolve #12

Author: dou-du

widget_code_input/_version.py

@@ -4,5 +4,5 @@
 # Copyright (c) Dou Du.
 # Distributed under the terms of the Modified BSD License.
 
-version_info = (3, 0, 0)
+version_info = (3, 1, 0)
 __version__ = ".".join(map(str, version_info))