Do not ignore platform requirements on CI

We need to install versions that can be used by the platform under which
the tests are running.

Author: weierophinney

.travis.yml

@@ -31,11 +31,10 @@ notifications:
 
 before_install:
   - if [[ $EXECUTE_TEST_COVERALLS != 'true' ]]; then phpenv config-rm xdebug.ini || return 0 ; fi
-  - composer self-update
-  - if [[ $EXECUTE_TEST_COVERALLS == 'true' ]]; then composer require --dev --no-update satooshi/php-coveralls ; fi
 
 install:
-  - travis_retry composer install --no-interaction --ignore-platform-reqs
+  - travis_retry composer install --no-interaction
+  - if [[ $EXECUTE_TEST_COVERALLS == 'true' ]]; then composer require --dev satooshi/php-coveralls ; fi
 
 script:
   - if [[ $EXECUTE_TEST_COVERALLS == 'true' ]]; then ./vendor/bin/phpunit --coverage-clover clover.xml ; fi