Adjust dependencies and travis config

Author: bcrowe

.travis.yml

@@ -6,21 +6,12 @@ env:
     - RUN_TESTS=1
 
 php:
-  - 5.4
-  - 5.5
   - 5.6
   - 7.0
-  - hhvm
+  - 7.1
 
 sudo: false
 
-matrix:
-  include:
-    - php: 5.4
-      env: 'COMPOSER_FLAGS="--prefer-stable --prefer-lowest"'
-    - php: 5.6
-      env: PHPCS=1 RUN_TESTS=0
-
 before_script:
   - travis_retry composer self-update
   - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-source
@@ -30,4 +21,4 @@ script:
   - sh -c "if [ '$PHPCS' = '1' ]; then vendor/bin/phpcs -p -n --extensions=php --standard=psr2 ./src ./tests; fi"
 
 after_script:
-  - if [[ $TRAVIS_PHP_VERSION != 'hhvm' && $TRAVIS_PHP_VERSION != '7.0' ]]; then php vendor/bin/ocular code-coverage:upload --format=php-clover coverage.clover; fi
+  - php vendor/bin/ocular code-coverage:upload --format=php-clover coverage.clover

composer.json

@@ -20,7 +20,7 @@
         "cakephp/cakephp": "~3.4"
     },
     "require-dev": {
-        "phpunit/phpunit" : "~5.7",
+        "phpunit/phpunit": "^5.7|^6.0",
         "scrutinizer/ocular": "~1.1",
         "squizlabs/php_codesniffer": "~2.3.0"
     },