Move deps to peer deps

[iamolegga]

Hi, thanks for package!

I see, that there are packages, that could be moved to peer dependencies, because every nest app already use it:

"@nestjs/common": "6.3.1",
"reflect-metadata": "^0.1.12",
"rxjs": "^6.2.2",

Would you mind if I'll create PR to fix this?

[iamolegga]

Also if you want I can help with configuring ci/cd for testing and package deploying

[skunight]

OK，thank you