Write logs to the file

[RohovAlex]

Writing logs to the file was added. Closes: https://github.com/metatech-university/NodeJS-Fastify/issues/4

[tshemsedinov]

It will be good to add following tag in commit description

Closes: https://github.com/metatech-university/NodeJS-Fastify/issues/4

[tshemsedinov]

Hint: I'd advise to use git rebase instead of merge. That's about https://github.com/metatech-university/NodeJS-Fastify/pull/7/commits/f5cf16ddec5b75fc7bfbad22b3b2a014dd044e29

[JekRock]

As an inspiration:

• Rotating file stream
• pino transport for log rotation

But I personally like the approach suggested by pino - using external tools for log rotation, like logrotate.

[RohovAlex]

@nechaido Done, please review.

[RohovAlex]

@tshemsedinov @nechaido please review