Prompt before dropping the entire database

[niksoper]

This follows the same pattern as down to require a prompt before dropping the entire database via drop.

[coveralls]

Pull Request Test Coverage Report for Build 727

• 0 of 10 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 53.08%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/cli/main.go	0	10	0.0%

Totals
Change from base Build 723:	-0.1%
Covered Lines:	2559
Relevant Lines:	4821

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 726

• 0 of 9 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 53.091%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/cli/main.go	0	9	0.0%

Totals
Change from base Build 723:	-0.1%
Covered Lines:	2559
Relevant Lines:	4820

---

💛 - Coveralls

[dhui]

Thanks for the PR!
Just a few minor issues.