Update README.md to fix link to rust website

the rust-lang.org site requires www and doesn't redirect.
Update for rust RFC 52 changes
Merge pull request #392 from Arcterus/fix-build

Update for latest Rust and remove warnings
Merge pull request #393 from ebfe/rfc-52

Update for rust RFC 52 changes
Merge pull request #226 from neyer/master

Update README.md to avoid redirects to the Rust website
Update rust-crypto
Merge pull request #394 from ebfe/rust-crypto

Update rust-crypto
FreeBSD support
Merge pull request #396 from ebfe/freebsd

FreeBSD support
fmt: fix build
Merge pull request #397 from ebfe/fix-build-master

fmt: fix build with rust master
Fix deprecation warnings
id: add missing repr(C)
Merge pull request #398 from ebfe/deprecation
update whoami syntax for windows
Merge pull request #399 from Heather/fx1
update deprecated parts of sync
Merge pull request #400 from Heather/master
Fix typo (and macos build?)
Merge pull request #401 from ebfe/typo

Fix typo (and macos build?)