bump version to 0.4

Author: timvink

setup.py

@@ -9,7 +9,7 @@
 
 setup(
     name="mkdocs-print-site-plugin",
-    version="0.3.1",
+    version="0.4",
     description="MkDocs plugin that adds a page to your site combining all pages, allowing your site visitors to *File > Print > Save as PDF* the entire site.",
     long_description=long_description,
     long_description_content_type="text/markdown",