Tweak Travis config

.travis.yml

@@ -6,19 +6,22 @@ php:
   - 7.0.0
 
 env:
-  - PREFER_LOWEST=""
   - PREFER_LOWEST="--prefer-lowest"
 
 jobs:
   include:
-    - script: composer lint
+    - before_script: composer update --no-interaction --prefer-dist $PREFER_LOWEST
+      script: composer lint
       name: "Lint code"
+      env:
+      - PREFER_LOWEST=""
+      -php: 7.2.0
 
 script: composer test-ci
 before_script:
   - travis_retry composer self-update
   - travis_retry composer update --no-interaction --prefer-dist $PREFER_LOWEST
-  -
+
 before_install:
   - pip install --user codecov
 

composer.json

@@ -31,11 +31,11 @@
         "dingo/api": "2.0.0-alpha1",
         "mockery/mockery": "^1.2.0",
         "league/fractal": "^0.17.0",
-        "phpstan/phpstan": "^0.11.15"
+        "phpstan/phpstan": "^0.9.0"
     },
     "suggest": {
         "league/fractal": "Required for transformers support",
-        "nunomaduro/collision": "For better reporting of errors that are thrpwn when generating docs"
+        "nunomaduro/collision": "For better reporting of errors that are thrown when generating docs"
     },
     "autoload": {
         "psr-4": {