Update releasing instructions

Author: adamcrume

RELEASING.md

@@ -1,11 +1,13 @@
 ## Pre-release
 
+1. Clean up clippy lints
+1. Run `cargo audit` and fix any issues
 1. Generate protos
-   1. Run `cd tensorflow-proto-codegen; cargo run -- $PATH_TO_TENSORFLOW $PWD/..`
+   1. Run `cd tensorflow-proto-codegen; cargo run -- ${PATH_TO_TENSORFLOW?} $PWD/..`
    1. Update Cargo.toml in root and tensorflow-op-codegen to ensure version of protobuf exactly equals version of protoc_rust used
 1. Generate ops
-   1. Run `cd tensorflow-op-codegen; cargo run -- $PATH_TO_TENSORFLOW $PWD/..`
-   1. Run `cd tensorflow-op-codegen; cargo run --bin eager -- $PATH_TO_TENSORFLOW $PWD/..`
+   1. Run `cd tensorflow-op-codegen; cargo run -- ${PATH_TO_TENSORFLOW?} $PWD/..`
+   1. Run `cd tensorflow-op-codegen; cargo run --bin eager -- ${PATH_TO_TENSORFLOW?} $PWD/..`
    1. Run `cargo fmt` to format generated code
 1. Commit and push changes
 
@@ -19,12 +21,12 @@ Note that any crate not mentioned here (e.g. tensorflow-proto-codegen, tensorflo
 1. Ensure that the minimum supported Rust version in the README is up to date
 1. Update changelog.
 1. Bump version number of `tensorflow-sys` if necessary
-   1. Run `git log v${PREVIOUS_VERSION}..HEAD tensorflow-sys` and see if there were any changes. If not, skip.
+   1. Run `git log v${PREVIOUS_VERSION?}..HEAD tensorflow-sys` and see if there were any changes. If not, skip.
    1. Bump the version in `tensorflow-sys/Cargo.toml`
    1. Bump the version in `tensorflow-sys/README.md`
    1. Bump the version for `tensorflow-sys` in the root `Cargo.toml`
 1. Bump version number of `tensorflow-internal-macros` if necessary
-   1. Run `git log v${PREVIOUS_VERSION}..HEAD tensorflow-internal-macros` and see if there were any changes. If not, skip.
+   1. Run `git log v${PREVIOUS_VERSION?}..HEAD tensorflow-internal-macros` and see if there were any changes. If not, skip.
    1. Bump the version in `tensorflow-internal-macros/Cargo.toml`
    1. Bump the version for `tensorflow-internal-macros` in the root `Cargo.toml`
 1. Bump the version number in `Cargo.toml`
@@ -36,7 +38,7 @@ Note that any crate not mentioned here (e.g. tensorflow-proto-codegen, tensorflo
 1. If the version of tensorflow-sys was bumped, run `cargo publish` for tensorflow-sys. (Publish before tagging in case there are problems publishing and we need to add commits to fix them.)
 1. If the version of tensorflow-internal-macros was bumped, run `cargo publish` for tensorflow-internal-macros. (Publish before tagging in case there are problems publishing and we need to add commits to fix them.)
 1. Run `cargo publish`. (Publish before tagging in case there are problems publishing and we need to add commits to fix them.)
-1. Add a `v${VERSION}` tag and push it
+1. Add a `v${VERSION?}` tag and push it
 1. Run `./update-docs`
 1. Announce the release to the mailing list