Cannot compare head version of ObjectVersionId

[Mewel]

Comparing the head version of ObjectVersionId leads to a NPE. ObjectVersionId#equals() should check versionNum for null values.

@Test
public void equalsVersionId() {
    assertEquals(ObjectVersionId.head("a"), ObjectVersionId.head("a"));
    assertNotEquals(ObjectVersionId.head("a"), ObjectVersionId.head("b"));
}

[pwinckles]

@Mewel Thanks for the report! It's fixed in main. I'm not going to cut an immediate point-release though because I'm hoping to do a larger release sometime this coming week.

[pwinckles]

This is fixed in the 2.1.0 release that I just pushed out