Use iOS 10.1 to avoid duplicate 10.2 simulators

Author: bcylin

.travis.yml

@@ -3,7 +3,7 @@ osx_image: xcode8.2
 matrix:
   include:
     - env: VERSION=9.3
-    - env: VERSION=10.2
+    - env: VERSION=10.1
       script:
         - bundle exec rake ci:build[$VERSION]
         - make -B carthage

Rakefile

@@ -1,6 +1,6 @@
 task default: "ci:test"
 
-latest = "10.2"
+latest = "10.1"
 
 namespace :ci do
   desc "Build targets on Travis CI with a specified OS version, default OS=#{latest}"