chore: bump version of semver package

[mikemimik]

Updating the semver dependency.

Todos:

• bump minor version (& tag)
• publish package

Linked Issues:

• Update semver dep in primary dependencies of @npm/cli node-semver#289

[coveralls]

Coverage remained the same at 87.018% when pulling 665732e on feature/bump-semver-dep into dedb606 on master.

[coveralls]

Coverage remained the same at 87.018% when pulling 665732e on feature/bump-semver-dep into dedb606 on master.

[coveralls]

Coverage remained the same at 87.018% when pulling 665732e on feature/bump-semver-dep into dedb606 on master.

[mikemimik]

Tests are failing in node@6. This change represents a major bump, as it's breaking.