Removes node-soft-mirror from README
Removes node-soft-mirror from README

Because it should no longer be used and velocity:core includes all the code for the new mirrors.
DAB0mB/velocity,markandrewj/velocity-test-runner,DAB0mB/velocity,pbastowski/velocity,pbastowski/velocity,meteor-velocity/velocity,meteor-velocity/velocity,meteor-velocity/velocity,pbastowski/velocity,markandrewj/velocity-test-runner,markandrewj/velocity-test-runner,DAB0mB/velocity