Fix example with <select> and ngOptions
Fix example with <select> and ngOptions

Closes #14

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SimeonC/angular-credit-cards,bendrucker/angular-credit-cards,dingels35/angular-credit-cards,antoinepairet/angular-credit-cards,Noxwille/angular-credit-cards,matiasarayac/angular-credit-cards,dribehance/angular-credit-cards,robertbaker/angular-credit-cards,aspone/angular-credit-cards