🚀 Update dependencies and refactoring

• update to go-pg/v9
• cleanup dependencies
• update Hook's
• extend Readme for environment configuration

Configuration:

• yaml example

posgres:
    hostname: string
    username: string
    password: string
    database: string
    debug: bool
    pool_size: int
    options: # optional
      host: string
      sslkey: string
      sslmode: string
      sslcert: string
      sslrootcert: string

• env example

POSTGRES_HOSTNAME=string
POSTGRES_USERNAME=string
POSTGRES_PASSWORD=string
POSTGRES_DATABASE=string
POSTGRES_DEBUG=bool
POSTGRES_POOL_SIZE=int
POSTGRES_OPTIONS_HOST=string
POSTGRES_OPTIONS_SSLKEY=string
POSTGRES_OPTIONS_SSLMODE=string
POSTGRES_OPTIONS_SSLCERT=string
POSTGRES_OPTIONS_SSLROOTCERT=string