[VOTE] Releasing Hipparchus 2.0 from release candidate 6 (was RC5)

As per discussion here, a release candidate 6 was done. There are no differences in code with release candidate 5. The only change was one the generated website, where we changed the CDN for commonly used javascript libraries. This change was done by merging pull request 154.

The new URL for maven artifacts is: https://oss.sonatype.org/content/repositories/orghipparchus-1037/.

So we keep the same vote thread going and consider all votes already cast are still valid, and we don’t change the end time of the vote.