stick with phpunit in require-dev, for IDE use and to lessen complications with reflection-* deps

Author: ashnazg

.travis.yml

@@ -12,7 +12,6 @@ matrix:
 install:
   - travis_retry composer install --no-interaction --prefer-dist --optimize-autoloader
   - travis_retry wget https://phar.io/releases/phive.phar
-  - travis_retry composer require --dev phpunit/phpunit # cannot trust phpunit.phar, because of reflection-docblock in that phar..."
 
 script:
   - ./vendor/bin/phpunit --no-coverage

composer.json

@@ -13,7 +13,8 @@
         "phpdocumentor/reflection-common": "^1.0"
     },
     "require-dev": {
-        "mockery/mockery": "^1.0"
+        "mockery/mockery": "^1.0",
+        "phpunit/phpunit": "^6.5"
     },
     "autoload": {
         "psr-4": {