update version number (#436)

Author: jtgrasb

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "wecopttool"
-version = "3.1.0"
+version = "3.1.1"
 description = "WEC Design Optimization Toolbox"
 readme = "README.md"
 authors = [