[zerocopy] Publish 0.3.1

Change-Id: I65825dadf73c8e20c858b9e724486f667c7e4166
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/496020
Commit-Queue: Tyler Mandry <tmandry@google.com>
Commit-Queue: Joshua Liebow-Feeser <joshlf@google.com>
Reviewed-by: Tyler Mandry <tmandry@google.com>

Cargo.toml.crates-io

@@ -7,7 +7,7 @@
 [package]
 edition = "2018"
 name = "zerocopy"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Joshua Liebow-Feeser <joshlf@google.com>"]
 description = "Utilities for zero-copy parsing and serialization"
 license = "BSD-3-Clause"