When I run a composer update I get this error message:
Loading composer repositories with package information
Updating dependencies (including require-dev)
Failed to download psr/log from dist: The zip extension and unzip command are both missing, skipping.
The php.ini used by your command-line PHP is: /etc/php/7.0/cli/php.ini
Now trying to download from source
What do I need to do to enable the zip and unzip commands so that composer can download dependencies?