Changed iphonesimulator for travis to 8.4
Changed iphonesimulator for travis to 8.4

jason790/RFCalculatorKeyboard,carabina/RFCalculatorKeyboard,mohsinalimat/RFCalculatorKeyboard,mohsinalimat/RFCalculatorKeyboard,sprint84/RFCalculatorKeyboard,sprint84/CalculatorKeyboard,carabina/RFCalculatorKeyboard