chore(filecoin-proofs): release 0.6.4

Author: laser

filecoin-proofs/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "filecoin-proofs"
 description = "The Filecoin specific aspects of storage-proofs, including a C based FFI, to generate and verify proofs."
-version = "0.6.3"
+version = "0.6.4"
 authors = ["dignifiedquire <dignifiedquire@gmail.com>", "laser <l@s3r.com>", "porcuquine <porcuquine@users.noreply.github.com>"]
 license = "MIT OR Apache-2.0"
 edition = "2018"