add wechaty ca, see wechaty/php-wechaty#16

Author: zhangchunsheng

docker/centos/7/php/README.md

@@ -142,6 +142,12 @@ docker run -ti \
   phpwechaty/php-wechaty:v1 \
   examples/ding-dong-bot.php
 
+php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
+php -r "if (hash_file('sha384', 'composer-setup.php') === '906a84df04cea2aa72f40b5f787e49f22d4c2f19492ac310e8cba5b96ac8b64115ac402c8cd292b8a03482574915d1a8') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
+php composer-setup.php
+php -r "unlink('composer-setup.php');"
+mv composer.phar /usr/local/bin/composer
+
 # docker stop wechaty_puppet_service_token_gateway
 
 tree conf