Semantic version for dev releases

[Waldz]

• NPM packages cant have our latest release because they are compatible with https://docs.npmjs.com/getting-started/semantic-versioning
• Start latest release 0.4-dev or 0.4-rc as per proposal
  here Fixed build version for deb packages #430 (comment)

[Waldz]

In another projects I've seen unofficial semantic version like this:

const Version = "0.0.20181001-dirty"

[soffokl]

We can get a version of the latest dev release from pre-releases:

curl https://api.github.com/repos/mysteriumnetwork/node/releases | \
jq '( first(.[]  | select(.prerelease == true)) ) | .tag_name'

In this case we can manually control version of the next release by pre-release tag.

So it can be 0.5-rc or anything similar.