Pre-release 0.6.0-pre.1

Update changelog for chacha, hc128 and isaac sub-crates

Update changelog for chacha, hc128 and isaac sub-crates

Update changelog for chacha, hc128 and isaac sub-crates

Update changelog for chacha, hc128 and isaac sub-crates

Merge pull request rust-random#619 from dhardy/core-0.2

rand_core 0.2.2: a compatibility shim around 0.3

Merge pull request rust-random#614 from dhardy/0.5

[0.5 branch] Prepare rand_core 0.3 release

Fix rand_derive homepage

Prepare 0.4.3 release

Merge pull request rust-random#584 from dhardy/0.5

Prepare 0.5.5 release