Capitalize background scripts

src/background/domains/CompletionItem.js

@@ -0,0 +1,24 @@
+export default class CompletionItem {
+  constructor({ caption, content, url, icon }) {
+    this.caption0 = caption;
+    this.content0 = content;
+    this.url0 = url;
+    this.icon0 = icon;
+  }
+
+  get caption() {
+    return this.caption0;
+  }
+
+  get content() {
+    return this.content0;
+  }
+
+  get url() {
+    return this.url0;
+  }
+
+  get icon() {
+    return this.icon0;
+  }
+}