Update setup.py

Author: sobolevn

setup.py

@@ -17,7 +17,7 @@
 
 setup(
     name="pytest-mypy-plugins",
-    version="3.1.1",
+    version="3.1.2",
     description="pytest plugin for writing tests for mypy plugins",
     long_description=readme,
     long_description_content_type="text/markdown",