Compile errors due to dependency problems with dep

[savely-krasovsky]

I use dep for my projects, with usual dep use it cannot download right dependencies automatically. Didn't check it with go get and others managers, maybe related to them too.

Expected Behavior

After den ensure project should compile without any errors.

Current Behavior

It cannot because of updated lego and fasthttp libs.

Possible Solution

Edit manually Gopkg.toml by adding this:

[[override]]
  name = "github.com/xenolf/lego"
  version = "0.5.0"

[[override]]
  name = "github.com/valyala/fasthttp"
  version = "1.0.0"

and try dep ensure again (you can also try to delete Gopkg.lock and vendor files before).

Steps to Reproduce (for bugs)

1. Use dep
2. Download dependencies by using dep ensure command

Context

I wanted to get it work with dep because vgo on 1.10 is pretty unstable for production use.

Your Environment

• Version used: v1.2.0
• Environment name and version (e.g. Go1.9 on CentOS 7, kernel 4.11.2): Fedora 28, Go 1.10.3, 4.18.12
• Server type and version: net/http
• Operating System and version: Fedora 28
• Link to your project: none