use switch for pagination

app/assets/javascripts/vue_pagination/index.js.es6

@@ -66,18 +66,24 @@
         const text = e.target.innerText;
         const { totalPages, nextPage, previousPage } = this.pageInfo;
 
-        if (text === SPREAD) {
-          return;
-        } else if (text === LAST) {
+        switch (text) {
+          case SPREAD:
+            break;
+          case LAST:
             pageNum = totalPages;
-        } else if (text === NEXT) {
+            break;
+          case NEXT:
             pageNum = nextPage;
-        } else if (text === PREV) {
+            break;
+          case PREV:
             pageNum = previousPage;
-        } else if (text === FIRST) {
+            break;
+          case FIRST:
             pageNum = 1;
-        } else {
+            break;
+          default:
             pageNum = +text;
+            break;
         }
 
         this.change(pageNum, apiScope);