Add support for Python 3.7

.travis.yml

@@ -1,10 +1,11 @@
 language: python
+sudo: true
+dist: xenial
 python:
 - '2.7'
-- '3.4'
-- '3.5'
 - '3.6'
-- pypy
+- '3.7'
+- pypy3.5
 install:
 - pip install coveralls
 - pip install 'coverage<4'

setup.py

@@ -43,8 +43,7 @@
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
     ]
 )

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = flake8,py27,py34,py35,py36
+envlist = flake8,py27,py34,py35,py36,py37
 
 [flake8]
 ; E501: line too long (X > 79 characters)
@@ -35,3 +35,6 @@ basepython = python3.5
 
 [testenv:py36]
 basepython = python3.6
+
+[testenv:py37]
+basepython = python3.7

voluptuous/schema_builder.py

@@ -898,7 +898,6 @@ def _iterate_object(obj):
         for key in slots:
             if key != '__dict__':
                 yield (key, getattr(obj, key))
-    raise StopIteration()
 
 
 class Msg(object):