Ensure PECL's php_ini is set when installing extension on Travis

See: https://travis-ci.org/mongodb/mongo-php-library/jobs/97290573

Author: jmikola

.travis.yml

@@ -31,6 +31,7 @@ before_script:
   - if dpkg --compare-versions ${SERVER_VERSION} le "2.4"; then export SERVER_SERVICE=mongodb; else export SERVER_SERVICE=mongod; fi
   - if ! nc -z localhost 27017; then sudo service ${SERVER_SERVICE} start; fi
   - mongod --version
+  - pecl config-set php_ini ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
   - pecl install -f mongodb-${DRIVER_VERSION}
   - php --ri mongodb
   - composer install --dev --no-interaction --prefer-source