Release 1.0.18

Merge pull request #68 from jhpratt/master

Optimize 128-bit integer formatting

Fill in pointer cast type

Merge pull request #67 from xtqqczze/as_mut_ptr

Simplify pointer usage in Buffer::format method

Switch to 9975WX benchmark data

Delete old chart code

Release 1.0.17

Use performance chart from itoa-benchmark

Update ryu links to zmij

Set repr(C) on DECIMAL_PAIRS

Release 1.0.16

Exclude benchmark dependencies from being compiled by miri

Merge pull request #65 from dtolnay/up