Update Dockerfile

Dockerfile

@@ -35,8 +35,8 @@ RUN echo "Listen 8000" > /etc/apache2/ports.conf
 
 # configure mod_php
 RUN a2enmod rewrite
-RUN sed -e 's/upload_max_filesize = .*/upload_max_filesize = 100M/' \
-        -e 's/post_max_size = .*/post_max_size = 100M/' \
+RUN sed -e 's/upload_max_filesize = .*/upload_max_filesize = 500M/' \
+        -e 's/post_max_size = .*/post_max_size = 500M/' \
         -e 's,;session.save_path.*,session.save_path = "/run/wordpress/sessions",' \
         -i /etc/php/7.0/apache2/php.ini