add travis to try build and spell check (#6)

.travis.yml

@@ -0,0 +1,18 @@
+language: python
+python: "3.5"
+dist: trusty
+sudo: true
+before_install:
+  - sudo apt update && sudo apt install -y enchant
+install:
+  - pip install -U setuptools
+  - pip install -U pyenchant sphinx-rtd-theme sphinxcontrib-spelling
+script:
+  - make spelling
+  # show list of misspelled words
+  - cat "_build/spelling/output.txt"
+  - make html
+  # fail the build in case of any misspelled words
+  - if [[ -s "_build/spelling/output.txt" ]]; then false; fi
+notifications:
+  email: false

conf.py

@@ -43,6 +43,9 @@
 try:
     import sphinxcontrib.spelling  # noqa: F401
     extensions.append('sphinxcontrib.spelling')
+
+    from sphinxcontrib.spelling.filters import ContractionFilter
+    spelling_filters = [ContractionFilter]
 except ImportError:
     pass