1.5.0-rc2

OMG A Big congratulation to @karanphil for his 2y+ PR
That's a guinness scilpy record 👍

We will keep rc-2 for a week or so and if everything adds up we'll release 1.5.0 !!!

What's Changed

• Fixing warning always showing up. by @EmmaRenauld in #693
• Fix default sphere tracking by @arnaudbore in #692
• Update to hotdipy + fix load empty sft by @arnaudbore in #694
• [WIP] Adding b-tensor encoding scripts like compute_fodf/frf and metrics by @karanphil in #425

Full Changelog: 1.5.0-rc1...1.5.0-rc2