Add matrix for Laravel 5.8 and PHP 7.3, remove unused matrix

Author: richan-fongdasen

.travis.yml

@@ -5,26 +5,22 @@ dist: trusty
 matrix:
   fast_finish: true
   include:
-    - php: 5.5.9
-      env: LARAVEL=5.1.* ORCHESTRA=3.1.*
-    - php: 5.5.9
-      env: LARAVEL=5.2.* ORCHESTRA=3.2.*
-    - php: 5.6
-      env: LARAVEL=5.3.* ORCHESTRA=3.3.*
-    - php: 5.6
-      env: LARAVEL=5.4.* ORCHESTRA=3.4.*
-    - php: 7.0
-      env: LARAVEL=5.5.* ORCHESTRA=3.5.* COVERAGE=1
+    - php: 7.1
+      env: LARAVEL=5.5.* ORCHESTRA=3.5.*
     - php: 7.1
       env: LARAVEL=5.6.* ORCHESTRA=3.6.*
     - php: 7.2
       env: LARAVEL=5.7.* ORCHESTRA=3.7.*
+    - php: 7.2
+      env: LARAVEL=5.8.* ORCHESTRA=3.8.* COVERAGE=1
+    - php: 7.3
+      env: LARAVEL=5.8.* ORCHESTRA=3.8.*
 
   allow_failures:
     - env: COVERAGE=1
 
 before_install:
-  - if [[ $TRAVIS_PHP_VERSION != 7.0 ]] ; then phpenv config-rm xdebug.ini; fi
+  - phpenv config-rm xdebug.ini
   - travis_retry composer self-update
 
 before_script: