Richard Mealing

NPE when using Requirement.buildNPM with ^16.0.0-0

2

Trying to create an npm version requirement of `^16.0.0-0` results in a `NullPointerException` i.e. `Requirement.buildNPM("^16.0.0-0");` gives ``` java.lang.NullPointerException: null at com.vdurmont.semver4j.Semver.(Semver.java:26) at com.vdurmont.semver4j.Requirement.hyphenRequirement(Requirement.java:487) at com.vdurmont.semver4j.Requirement.evaluateReversePolishNotation(Requirement.java:338) at com.vdurmont.semver4j.Requirement.buildWithTokenizer(Requirement.java:138) at com.vdurmont.semver4j.Requirement.buildNPM(Requirement.java:112) ```...