Merge pull request #27 from Chilipp/sphinx-3.0

Add tests for sphinx=3.0

Author: Chilipp

.travis.yml

@@ -9,6 +9,7 @@ python:
   - "2.7"
 env:
   - SPHINX_VERSION=""
+  - SPHINX_VERSION=3.0.*
   - SPHINX_VERSION=2.4.*
   - SPHINX_VERSION=2.3.*
   - SPHINX_VERSION=2.2.*
@@ -22,6 +23,8 @@ env:
   - SPHINX_VERSION=1.3.*
 matrix:
   exclude:
+    - python: "2.7"
+      env: SPHINX_VERSION=3.0.*
     - python: "2.7"
       env: SPHINX_VERSION=2.0.*
     - python: "2.7"
@@ -55,7 +58,6 @@ matrix:
     - python: "3.8"
       env: SPHINX_VERSION=1.9.*
 
-
 install:
   - pip install coveralls
   # install sphinx