Updates for fd 8.5.2

Updates for fd 8.5.1

Update Usage in Readme

Update jemalloc to 5.3 (jemallocator 0.5)

Benchmarks show that this is a tiny bit faster than what we had
previously.

Add temporary version of logo

Bump version to v8.3.1

Update usage section

Bump version to v8.2.1

Update CHANGELOG

Bump version to 8.1.1