Tag format for pre-release versions does not follow semantic versioning standard breaking the "dep" tool

[ray-harris]

The dep tool is becoming the standard mechanism for managing dependencies in go. It follows the semantic versioning rules outlined in https://semver.org

Current in the project, there are two pre-release tags, v2.0.0.beta.1 and v2.0.0.beta.2, but they don't follow the semver rules. They should be v2.0.0-beta.1 and v2.0.0-beta.2 instead.

Not following the semver rules causes dep to break when trying to use these versions. The only way to get it to work is to pin the exact branch using the revision constraint instead of the version constraint.

Recommend committing a tag such as v2.0.0-beta.2 to allow dependency management with dep during pre-release.

This is the revision constraint that works but doesn't allow upgrading to a newer version when it's released:

[[constraint]]
  name = "github.com/nicksnyder/go-i18n"
  revision = "v2.0.0.beta.2"

This would be the preferred way of specifying the constraint using version:

[[constraint]]
  name = "github.com/nicksnyder/go-i18n"
  version = "v2.0.0-beta.2"

Thanks

[nicksnyder]

Oops! This was not intentional and I will fix.

[nicksnyder]

I tagged a new release v2.0.0-beta.3 and added proper tags for the previous releases.