Test with PyPy 2.6.0
diff --git a/.travis/install.sh b/.travis/install.sh
index 7c3e9de..9db2743 100755
--- a/.travis/install.sh
+++ b/.travis/install.sh
@@ -35,8 +35,8 @@
             ;;
         pypy)
             brew outdated pyenv || brew upgrade pyenv
-            pyenv install pypy-2.5.1
-            pyenv global pypy-2.5.1
+            pyenv install pypy-2.6.0
+            pyenv global pypy-2.6.0
             ;;
         pypy3)
             brew outdated pyenv || brew upgrade pyenv