fix(package): update vue-sweetalert2 to version 3.0.4

Closes #70

Author: greenkeeper[bot]

package.json

@@ -74,7 +74,7 @@
     "vue-loading-spinner": "^1.0.11",
     "vue-notification": "^1.3.16",
     "vue-router": "^3.0.7",
-    "vue-sweetalert2": "^2.1.1",
+    "vue-sweetalert2": "^3.0.4",
     "vuejs-datepicker": "^1.6.2",
     "vuelidate": "^0.7.4",
     "vuex": "^3.1.1",