Travis-ci: added support for ppc64le

.travis.yml

@@ -2,16 +2,39 @@ language: python
 matrix:
   include:
     - python: 3.6
+      arch: amd64
       env: TOXENV=py
     - python: 3.5
+      arch: amd64
       env: TOXENV=py
     - python: 3.4
+      arch: amd64
       env: TOXENV=py
     - python: 2.7
+      arch: amd64
+      env: TOXENV=py
+    - python: 3.6
+      arch: ppc64le
+      env: TOXENV=py
+    - python: 3.5
+      arch: ppc64le
+      env: TOXENV=py
+    - python: 3.4
+      arch: ppc64le
+      env: TOXENV=py
+    - python: 2.7
+      arch: ppc64le
       env: TOXENV=py
     - python: pypy
       env: TOXENV=py
+
 sudo: false
+
+before_install:
+     - | 
+        if [[ "$TRAVIS_CPU_ARCH" == "ppc64le" ]]; then
+            sudo chown -Rv $USER:$GROUP ~/.cache/pip/wheels
+        fi
 install:
     - pip install -U pip
     - pip install -U tox coverage coveralls