Merge pull request #2630 from reaperhulk/travis-update-osx

update osx_image values based on travis supported versions
diff --git a/.travis.yml b/.travis.yml
index 4ded04d..b4d3d05 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -51,43 +51,46 @@
           env: TOXENV=py3pep8
         - language: generic
           os: osx
-          osx_image: xcode7
+          # 7.1 is OS X 10.10.x
+          # see: https://docs.travis-ci.com/user/languages/objective-c/#Supported-OS-X-iOS-SDK-versions
+          osx_image: xcode7.1
           env: TOXENV=py26 CRYPTOGRAPHY_OSX_NO_LINK_FLAGS=1
         - language: generic
           os: osx
-          osx_image: xcode7
+          osx_image: xcode7.1
           env: TOXENV=py27 CRYPTOGRAPHY_OSX_NO_LINK_FLAGS=1
         - language: generic
           os: osx
-          osx_image: xcode7
+          osx_image: xcode7.1
           env: TOXENV=py33 CRYPTOGRAPHY_OSX_NO_LINK_FLAGS=1
         - language: generic
           os: osx
-          osx_image: xcode7
+          osx_image: xcode7.1
           env: TOXENV=py34 CRYPTOGRAPHY_OSX_NO_LINK_FLAGS=1
         - language: generic
           os: osx
-          osx_image: xcode7
+          osx_image: xcode7.1
           env: TOXENV=py35 CRYPTOGRAPHY_OSX_NO_LINK_FLAGS=1
         - language: generic
           os: osx
-          osx_image: xcode7
+          osx_image: xcode7.1
           env: TOXENV=pypy CRYPTOGRAPHY_OSX_NO_LINK_FLAGS=1
         - language: generic
           os: osx
-          osx_image: xcode7
+          osx_image: xcode7.1
           env: TOXENV=py27 CRYPTOGRAPHY_OSX_NO_LINK_FLAGS=0
         - language: generic
           os: osx
-          osx_image: osx10.11
+          # 7.2 is OS X 10.11.x
+          osx_image: xcode7.2
           env: TOXENV=py26 CRYPTOGRAPHY_OSX_NO_LINK_FLAGS=1
         - language: generic
           os: osx
-          osx_image: osx10.11
+          osx_image: xcode7.2
           env: TOXENV=py27 CRYPTOGRAPHY_OSX_NO_LINK_FLAGS=1
         - language: generic
           os: osx
-          osx_image: xcode7
+          osx_image: xcode7.2
           env: TOXENV=docs CRYPTOGRAPHY_OSX_NO_LINK_FLAGS=1
 
 install: