수정 기능 추가

src/api/can.js

@@ -35,11 +35,16 @@ async function downloadCouponNumberList(couponId) {
     return Vue.axios.get('/can/coupon/number-list/download?couponId=' + couponId, { responseType: 'blob' });
 }
 
+async function modifyCoupon(request) {
+    return Vue.axios.put('/can/coupon', request);
+}
+
 export {
     getCans,
     insertCan,
     deleteCan,
     paymentCan,
+    modifyCoupon,
     getCouponList,
     generateCoupon,
     getCouponNumberList,