Revert "use Xenial on Travis (#1201)"

This reverts commit 10592b664a.

.travis.yml

@@ -1,8 +1,7 @@
-dist: xenial
+dist: trusty
 sudo: required
 services:
   - docker
-  - xvfb
 addons:
   chrome: stable
 language: node_js
@@ -17,6 +16,7 @@ before_install:
   - sudo /etc/init.d/postgresql stop
   - npm install -g npm@latest
   - export DISPLAY=:99.0
+  - sh -e /etc/init.d/xvfb start
   - sleep 3
 
 stages:

e2e/components/breadcrumb/breadcrumb.ts

@@ -53,7 +53,7 @@ export class Breadcrumb extends Component {
   }
 
   async getAllItems() {
-    return this.items.map(async (elem: ElementFinder) => {
+    return this.items.map(async elem => {
       const str = await elem.getText();
       return str.split('\nchevron_right')[0];
     });