Try to restart mysql

.travis.yml

@@ -1,11 +1,19 @@
 language: php
+sudo: true
+dist: trusty
 php:
     - '7.2'
     - nightly
-services:
+addons:
-    - mysql
+  apt:
+    sources:
+        - mysql-5.7-trusty
+    packages:
+        - mysql-server
+        - mysql-client
 before_script:
-    - echo "USE mysql;\nUPDATE user SET password=PASSWORD('password') WHERE user='root';\nFLUSH PRIVILEGES;\n" | mysql -u root
+    - sudo mysql -e "use mysql; update user set authentication_string=PASSWORD('new_password') where User='root'; update user set plugin='mysql_native_password';FLUSH PRIVILEGES;"
+    - sudo mysql_upgrade
     - sudo service mysql restart
     - pecl install ast
     - composer install