Added .readthedocs.yml to better control readthedocs documentation build

.readthedocs.yml

@@ -0,0 +1,28 @@
+# .readthedocs.yml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: docs/conf.py
+
+# Build documentation with MkDocs
+#mkdocs:
+#  configuration: mkdocs.yml
+
+# Optionally build your docs in additional formats such as PDF and ePub
+formats: all
+
+# Optionally set the version of Python and requirements required to build your docs
+python:
+  version: 3.7
+  system_packages: true
+
+  install:
+    - requirements: requirements.txt
+    - requirements: docs/requirements.txt
+    - method: pip
+      path: .

.travis.yml

@@ -7,6 +7,8 @@ os:
 - linux
 
 language: python
+# we want to run the build & unit tests (as specified under "script" below)
+# for each of Python 3.5, 3.6, and 3.7
 python:
   - "3.5"
   - "3.6"