Switching Travis CI builds to Ubuntu Bionic Beaver

According to the [documentation](https://docs.travis-ci.com/user/reference/trusty/#container-based-infrastructure), `sudo: false` is no longed needed since Trusty.

Switching Travis CI builds to Ubuntu Bionic Beaver
According to the [documentation](https://docs.travis-ci.com/user/reference/trusty/#container-based-infrastructure), `sudo: false` is no longed needed since Trusty.
22dfe16f · Sergei Morozov · d1695ed1 · 22dfe16f
Unverified Commit 22dfe16f authored Dec 19, 2019 by Sergei Morozov
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.travis.yml .travis.yml +4 -5

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--- a/.travis.yml
+++ b/.travis.yml
 language: php
-sudo: false
+dist: bionic
-dist: xenial
 cache:
-    directories:
+  directories:
-        - vendor
+    - vendor
-        - $HOME/.composer/cache
+    - $HOME/.composer/cache
 before_install:
  - phpenv config-rm xdebug.ini || true