Improved Travis

Author: lookyman

.travis.yml

@@ -6,11 +6,14 @@ cache:
   directories:
     - $HOME/.composer/cache
 
-env: # intentionally blank
+env:
+  - DEPENDENCIES="--prefer-lowest"
+  - DEPENDENCIES=""
 
 php:
   - 7.1
   - 7.2
+  - master
 
 matrix:
   fast_finish: true
@@ -20,9 +23,10 @@ matrix:
   allow_failures:
     - php: 7.2
       env: COVERAGE="1"
+    - php: master
 
 install:
-  - travis_retry composer install --no-interaction --prefer-dist
+  - travis_retry composer update --no-interaction --prefer-dist $DEPENDENCIES
 
 script:
   - >