Add verbose flag

Add verbose flag --verbose for get more info in console

Update cmd flags. Update template

Features:

• add CMD flags for change path and filename for env file.

Other:

• add examples;
• add DB_HOST and DB_PORT variables for create connection;
• update entry.go template.

Add Postgres builder

Features:

• Add query builder for Postgres.

Bugfixes:

• fixed the set default value;
• fixed the multiply drop columns:
• fixed initial script and README.

GoLang migration system

Added basic migration system
Added query builder for MySQL