last attempt

.travis.yml

@@ -10,7 +10,7 @@ python:
   # - "pypy"  -- appears to hang
   # - "pypy3"
 # command to install dependencies
-install: "pip install pipenv; pipenv install --system"
+install: "pip install pipenv; pipenv install --dev --system"
 # command to run tests
 script:
   - make coverage

requirements.txt

@@ -0,0 +1,29 @@
+alabaster==0.7.9
+Babel==2.3.4
+click==6.7
+codecov==2.0.5
+coverage==4.3.4
+decorator==4.0.11
+docutils==0.13.1
+Flask==0.12
+funcsigs==1.0.2
+httpbin==0.5.0
+imagesize==0.7.1
+itsdangerous==0.24
+Jinja2==2.9.4
+MarkupSafe==0.23
+mock==2.0.0
+pbr==1.10.0
+py==1.4.32
+Pygments==2.1.3
+PySocks==1.6.5
+pytest==3.0.5
+pytest-cov==2.4.0
+pytest-httpbin==0.2.3
+pytest-mock==1.5.0
+pytz==2016.10
+requests==2.12.5
+six==1.10.0
+snowballstemmer==1.2.1
+Sphinx==1.5.1
+Werkzeug==0.11.15