Scala Graal Versions Save

• Set versionScheme to "early-semver"
• Upgrade microlibs to 4.0.0
• Update Scala.js to 1.7

Changelog: https://github.com/japgolly/scala-graal/blob/master/doc/changelog/1.2.0.md

Changelog: https://github.com/japgolly/scala-graal/blob/master/doc/changelog/1.1.1.md

Changelog: https://github.com/japgolly/scala-graal/blob/master/doc/changelog/1.1.0.md

Changelog: https://github.com/japgolly/scala-graal/blob/master/doc/changelog/1.0.1.md

Changelog:

https://github.com/japgolly/scala-graal/blob/master/doc/changelog/1.0.0.md