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This is to accomodate Pg::Explain 0.95

To do it, simply:

  <iframe src="https://explain.depesz.com/i/<ID>"></iframe>

If explain was originally in json/yaml/xml format, add syntax-highlight
to the source of it.

Also - in such cases, add text view - explain regenerated to text
format.

Bumped the PostgreSQL version to 11.4

See merge request !14

This requires PostgreSQL 11, but makes for simpler queries.

- display planning time, if available
- display execution time, if available
- display trigger execution table, if available
- use real execution time, instead of execution time of top level node,
if available

There was too much spam from this contact form, so let's make it harder
for spammers to use.

Changing of the library is not a simple "change name of used module".
They have different interfaces, so it had to be fixed too.

Replace deprecated Mail::Sender with Email::Sender

See merge request !13

Add docker-compose build steps

See merge request !12

As Mail::Sender is deprecated, libmail-sender-perl is
no longer available on e.g. debian stretch. Updating to
use Email::Sender and libemail-sender-perl works well.

docker-compose is a quick way to spin up this project.