Update README.md to fix link to rust website

the rust-lang.org site requires www and doesn't redirect.
wc: stop buffering stdin twice
Merge pull request #347 from Arcterus/master

Add shuf to Cargo.toml and remove shuf from to-do list
Merge pull request #348 from Arcterus/wc-buffering

wc: stop buffering stdin twice
kill: implement short signals (fixes #242) and bug fixes
Merge pull request #349 from Arcterus/kill-short-sigs

kill: implement short signals (fixes #242) and bug fixes
wc: fix build
Merge pull request #350 from ebfe/wc

wc: fix build
wc: add message when reading directories
Merge pull request #351 from Arcterus/wc-message

wc: add message when reading directories
cksum: add massive performance improvements
Merge pull request #352 from Arcterus/cksum-perf

cksum: add massive performance improvements
cksum: improve performance slightly
base64: slightly improve decoding performance speed
Merge pull request #355 from Arcterus/perf

Performance improvements
fmt: switch to char.width() method
Merge pull request #356 from kwantam/master

fmt: switch to char.width() method
Small performance enhancements

Get rid of half filled heuristic and use unsafe array indexing because
the indices should always be correct.
add test
Merge pull request #357 from polyphemus/cut-bytes-rewrite

Small performance enhancements for cut: bytes cutting