Update to crc32c 0.6.6

Get the fix for zowens/crc32c#58

Author: sourcefrog

Cargo.lock

@@ -25,7 +25,7 @@ blake2-rfc = "0.2.18"
 bytes = "1.5"
 cachedir = "0.3"
 clicolors-control = "1.0"
-crc32c = { version = "0.6.5", optional = true }
+crc32c = { version = "0.6.6", optional = true }
 derive_more = "0.99"
 fail = { version = "0.5.1" }
 filetime = "0.2"