removed --no-update to make installation work

Author: Koopzington

.travis.yml

@@ -75,7 +75,7 @@ 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
+  - if [[ $EXECUTE_TEST_COVERALLS == 'true' ]]; then composer require --dev satooshi/php-coveralls ; fi
 
 install:
   - if [[ $DEPS == 'latest' ]]; then travis_retry composer update $COMPOSER_ARGS ; fi