Detect version in Git dependencies using #semver:^X.Y.Z format

[ibc]

• I have read the list of known issues before filing this issue.
• I have searched for similiar issues before filing this issue.

• node version: v8.9.4
• npm version: 5.8.0
• npm-check-updates version: 2.14.1

---

It'd be great if ncu also works with Git dependencies in package.json that use the SEMVER format to specify the version (Git tag in fact), as documented here:

<protocol>://[<user>[:<password>]@]<hostname>[:<port>][:][/]<path>[#<commit-ish> | #semver:<semver>]

Example:

"myPrivateLib": "github:myorg/myPrivateLib#semver:^1.3.0"

[raineorshine]

Closed with the revive-me tag for interested contributors. See #484.