fix: changed mysql settings for travis

Author: bashleigh

.env.dist

@@ -1,14 +1,15 @@
-MYSQL_ROOT_PASSWORD=root
 MYSQL_DATABASE=polymorphic
 MYSQL_USER=root
-MYSQL_PASSWORD=root
+MYSQL_PASSWORD=
+MYSQL_ROOT_PASSWORD=
+MYSQL_ALLOW_EMPTY_PASSWORD=true
 
 TYPEORM_CONNECTION=mysql
 TYPEORM_HOST=localhost
 TYPEORM_PORT=3306
 TYPEORM_DATABASE=polymorphic
 TYPEORM_USERNAME=root
-TYPEORM_PASSWORD=root
+TYPEORM_PASSWORD=
 TYPEORM_ENTITIES=src/__tests__/**/*.entity.ts
 TYPEORM_SYNCHRONIZE=true
 TYPEORM_LOGGING=true