Changed a Travis CI destination.

Author: arturgrigor

.travis.yml

@@ -15,7 +15,7 @@ env:
 
     - DESTINATION="OS=10.0,name=iPhone 7 Plus"     SCHEME="$IOS_FRAMEWORK_SCHEME"     RUN_TESTS="YES" POD_LINT="YES"
     - DESTINATION="OS=9.0,name=iPad 2"             SCHEME="$IOS_FRAMEWORK_SCHEME"     RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=8.1,name=iPhone 4S"          SCHEME="$IOS_FRAMEWORK_SCHEME"     RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=8.4,name=iPhone 4S"          SCHEME="$IOS_FRAMEWORK_SCHEME"     RUN_TESTS="YES" POD_LINT="NO"
 
     - DESTINATION="OS=10.0,name=Apple TV 1080p"    SCHEME="$TVOS_FRAMEWORK_SCHEME"    RUN_TESTS="YES" POD_LINT="NO"
     - DESTINATION="OS=9.0,name=Apple TV 1080p"     SCHEME="$TVOS_FRAMEWORK_SCHEME"    RUN_TESTS="YES" POD_LINT="NO"