Fixed issue with getting latest version of sccache crate.

[JohnPeel]

This fixes two issues.

1. Searching sccache with cargo returns multiple crates that the grep returns.
2. sccache now uses a "v" in front of the version on GitHub.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@911dd4a). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #8   +/-   ##
=========================================
  Coverage          ?   96.19%           
=========================================
  Files             ?       22           
  Lines             ?      289           
  Branches          ?        0           
=========================================
  Hits              ?      278           
  Misses            ?       11           
  Partials          ?        0           

Impacted Files	Coverage Δ
src/crc/crc32/crc32.rs	90.00% <ø> (ø)
src/crc/crc8/crc8.rs	88.88% <ø> (ø)
src/unix.rs	88.23% <ø> (ø)
tests/crc/crc.rs	100.00% <ø> (ø)

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