Adding tab role attributes

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

src/renderer/components/dock/dock-tabs.tsx

@@ -85,7 +85,7 @@ export const DockTabs = ({ tabs, autoFocus, selectedTab, onChangeTab }: DockTabs
   });
 
   return (
-    <div className={styles.dockTabs} ref={elem}>
+    <div className={styles.dockTabs} ref={elem} role="tablist">
       <Tabs
         autoFocus={autoFocus}
         value={selectedTab}

src/renderer/components/tabs/tabs.tsx

@@ -137,6 +137,7 @@ export class Tab extends React.PureComponent<TabProps> {
         onClick={this.onClick}
         onFocus={this.onFocus}
         onKeyDown={this.onKeyDown}
+        role="tab"
         ref={this.ref}
       >
         {typeof icon === "string" ? <Icon small material={icon}/> : icon}