Update travis php version

Author: aLLeXUs

.travis.yml

@@ -6,7 +6,7 @@ services:
 language: php
 
 php:
-    - 7.2
+    - 7.3
 
 cache:
   directories:
@@ -15,13 +15,13 @@ cache:
 before_install:
     - cd $TRAVIS_BUILD_DIR/backend
     - composer validate
-    - mysql -e 'CREATE DATABASE thread'      
+    - mysql -e 'CREATE DATABASE thread'
 
 install:
     - composer install --no-interaction --prefer-source
 
 before_script:
-    - cp .env.travis .env        
+    - cp .env.travis .env
     - php artisan migrate --force
 
 script:
@@ -30,4 +30,4 @@ script:
 after_success:
     - bash <(curl -s https://codecov.io/bash)
 
-      
+