Version 1.4.0

Updating version to version 1.4.0 due to the many changes in this
release. If anyone has explicitly pinned 1.3.x they will need to opt-in
to receive the security fixes, which do come with big changes that may
cahnge how Waitress handles HTTP requests.

setup.py

@@ -34,7 +34,7 @@
 
 setup(
     name="waitress",
-    version="1.3.1",
+    version="1.4.0",
     author="Zope Foundation and Contributors",
     author_email="zope-dev@zope.org",
     maintainer="Pylons Project",