removed iphone 6 test

Author: tristanhimmelman

.travis.yml

@@ -14,7 +14,6 @@ env:
     #iOS
     - DESTINATION="OS=11.4,name=iPhone X"            SCHEME="$IOS_FRAMEWORK_SCHEME"      RUN_TESTS="YES"
     - DESTINATION="OS=10.3.1,name=iPhone 7 Plus"     SCHEME="$IOS_FRAMEWORK_SCHEME"      RUN_TESTS="YES"
-    - DESTINATION="OS=9.3,name=iPhone 6"             SCHEME="$IOS_FRAMEWORK_SCHEME"      RUN_TESTS="YES"
     #macOS
     - DESTINATION="arch=x86_64"                      SCHEME="$OSX_FRAMEWORK_SCHEME"      RUN_TESTS="YES"
     #watchOS