Adding upstream version 1.4.13.

Signed-off-by: Daniel Baumann <daniel@debian.org>

.travis.yml

@@ -0,0 +1,17 @@
+language: python
+matrix:
+    include:
+        -   env: TOXENV=py27
+        -   env: TOXENV=py35
+            python: 3.5
+        -   env: TOXENV=py36
+            python: 3.6
+        -   env: TOXENV=pypy
+            python: pypy
+install: pip install coveralls tox
+script: tox
+after_success: coveralls
+cache:
+    directories:
+        - $HOME/.cache/pip
+        - $HOME/.cache/pre-commit