bug: Does not handle `>`

[legobeat]

Example scenario:

• user on Node.js v10.24.1
• package foo: engines.node=>10

The field can be any valid semver range.

Expected behavior:

error:

foo requires at least version 11.0.0 of Node, please upgrade

Actual behavior

Version test succeeds

Failing test-case: https://github.com/typicode/please-upgrade-node/pull/36/commits/99b6ebd3421b1035ec4b4c2f4ceeb4d82459540f