update travis config for laravel 7

Author: michaeldyrynda

.travis.yml

@@ -7,9 +7,17 @@ cache:
 matrix:
   include:
     - php: 7.2
-      env: ILLUMINATE_VERSION=6.0.*
+      env: ILLUMINATE_VERSION=6.*
     - php: 7.3
-      env: ILLUMINATE_VERSION=6.0.*
+      env: ILLUMINATE_VERSION=6.*
+    - php: 7.3
+      env: ILLUMINATE_VERSION=6.*
+    - php: 7.2
+      env: ILLUMINATE_VERSION=7.*
+    - php: 7.3
+      env: ILLUMINATE_VERSION=7.*
+    - php: 7.3
+      env: ILLUMINATE_VERSION=7.*
 
 before_install: travis_retry composer require "illuminate/database:${ILLUMINATE_VERSION}" "illuminate/events:${ILLUMINATE_VERSION}" --no-update -v