update travis

Author: clarkeash

.travis.yml

@@ -1,21 +1,35 @@
 language: php
 
-php:
-  - 7.1
+matrix:
+  include:
+  - php: 7.1
+    env: ILLUMINATE_MINOR_VERSION=5
+  - php: 7.2
+    env: ILLUMINATE_MINOR_VERSION=5
+  - php: 7.1
+    env: ILLUMINATE_MINOR_VERSION=6
+  - php: 7.2
+    env: ILLUMINATE_MINOR_VERSION=6
+  - php: 7.1
+    env: ILLUMINATE_MINOR_VERSION=7
+  - php: 7.2
+    env: ILLUMINATE_MINOR_VERSION=7
 
 cache:
   directories:
-    - $HOME/.composer/cache
+  - $HOME/.composer/cache
 
 before_install:
-  - travis_retry composer self-update
+- travis_retry composer self-update
+- composer require "illuminate/contracts:5.${ILLUMINATE_MINOR_VERSION}.*" --no-update
+- composer require "orchestra/testbench:3.${ILLUMINATE_MINOR_VERSION}.*" --dev --no-update
 
 install:
-  - travis_retry composer install --no-interaction --prefer-dist --no-suggest
+- travis_retry composer update --prefer-source --no-interaction --no-suggest --dev
 
 script:
-  - vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
+- vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
 
 after_script:
-  - wget https://scrutinizer-ci.com/ocular.phar
-  - php ocular.phar code-coverage:upload --format=php-clover coverage.clover
+- wget https://scrutinizer-ci.com/ocular.phar
+- php ocular.phar code-coverage:upload --format=php-clover coverage.clover