Add travis for different CPU archs (#296)

.travis.yml

@@ -0,0 +1,23 @@
+arch:
+  - ppc64le
+  - s390x
+  - arm64
+os: linux
+dist: focal
+language: python
+python: "3.8"
+
+branches:
+  only:
+  - master
+
+before_install:
+  - sudo apt-get --yes install libgeos-dev
+  - pip install numpy cython
+
+install:
+  - python setup.py build_ext --inplace
+  - pip install . --no-deps --no-build-isolation
+
+script:
+  - pytest --doctest-modules

README.rst

@@ -20,6 +20,12 @@ PyGEOS
 	:alt: Appveyor CI status
 	:target: https://ci.appveyor.com/project/caspervdw/pygeos-3e5cu
 
+.. Travis CI status -- https://travis-ci.com
+
+.. image:: https://travis-ci.com/pygeos/pygeos.svg?branch=master
+   :alt: Travis CI status
+   :target: https://travis-ci.com/github/pygeos/pygeos
+
 .. PyPI
 
 .. image:: https://badge.fury.io/py/pygeos.svg