Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

x/vgo fetched on 2018-02-30

What did you do?

$ git clone https://bitbucket.org/mellium/xmlstream.git
$ cd xmlstream
$ vgo build

What did you expect to see?

Deps zipfile downloaded using the Bitbucket API and build success.

What did you see instead?

vgo: resolving import "mellium.im/reader"
vgo: import "mellium.im/xmlstream" ->
        import "mellium.im/reader": unknown VCS, Repo: git, https://bitbucket.org/mellium/reader.git

Meta import looks like:

$ curl https://mellium.im/xmlstream?go-get=1
<meta name="go-import" content="mellium.im/xmlstream git https://bitbucket.org/mellium/xmlstream.git">

and it is fetchable with go get.

Since the vgo post says that it has special overrides to use the APIs for the hosting providers previously supported, I would expect this to detect that this is a Bitbucket URL and fetch a zip file using the API.