Merge pull request #62 from python/travis

Add a Travis CI configuration.

.travis.yml

@@ -0,0 +1,12 @@
+sudo: false
+language: python
+python:
+  - "3.5"
+  # More versions later.
+
+install:
+  - pip install git+git://github.com/JukkaL/mypy
+
+script:
+  - mypy stdlib/3/
+  # That doesn't test everything, but it's a start.

stdlib/3/traceback.pyi

@@ -1,5 +1,6 @@
 # Stubs for traceback
 
+from types import TracebackType
 import typing
 
 # TODO signatures