print supports out hex instead of decimal #1563

[Lei King]

1. What version of Delve are you using (dlv version)?
   Delve Debugger │
   Version: 1.2.0 │
   Build: $Id: 068e2451004e95d0b042e5257e34f0f08ce01466 $

2. What version of Go are you using? (go version)?
   go version go1.12 linux/amd64 │

3. What operating system and processor architecture are you using?
   linux

4. What did you do?
   p x ( x is []byte{})

5. What did you expect to see?

I want to see the hex, 0x11 0x22

6. What did you see instead?

I see the decimal 17 34 ...