Try macpython for 3.5, it doesn't seem to support 3.6. But homebrew doesn't support 3.5, only 3.6

.travis.yml

@@ -2,9 +2,6 @@ language: python
 sudo: false
 matrix:
     include:
-        - os: osx
-          language: generic
-          env: TERRYFY_PYTHON='homebrew 3.6'
         - os: linux
           python: 2.7
         - os: linux
@@ -27,7 +24,13 @@ matrix:
           env: TERRYFY_PYTHON='macpython 3.4'
         - os: osx
           language: generic
-          env: TERRYFY_PYTHON='homebrew 3.5'
+          env: TERRYFY_PYTHON='macpython 3.5'
+        # Homebrew only accepts the major version number and
+        # automatically rolls out new versions. At this writing, that
+        # is 3.6.0.
+        - os: osx
+          language: generic
+          env: TERRYFY_PYTHON='homebrew 3'
 before_install:
     - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then git clone https://github.com/MacPython/terryfy; fi
     - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then source terryfy/travis_tools.sh; fi