update Releasing docs

remove test_op build step

RELEASING.md

@@ -37,7 +37,7 @@ Note that any crate not mentioned here (e.g. tensorflow-proto-codegen, tensorflo
 1. Bump the version number in `Cargo.toml`
 1. Bump the version number in `README.md`
 1. Run `./test-all`
-1. Double-check that addition.py and test_op are built using the version of TensorFlow being linked against.  (See "Upgrading TensorFlow" section.)
+1. Double-check that addition.py is built using the version of TensorFlow being linked against.  (See "Upgrading TensorFlow" section.)
 1. Run `./run-valgrind`
 1. Commit and push the changes. (Push before publishing to ensure that the changes being published are up to date.)
 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.)
@@ -64,5 +64,4 @@ Note that any crate not mentioned here (e.g. tensorflow-proto-codegen, tensorflo
    1. Run `pip install --upgrade pip`
    1. Run `pip install --upgrade tensorflow==${TENSORFLOW_VERSION?}`
    1. Run `python examples/addition/addition.py`
-   1. Run `test_resources/library/build-test-op` and move `test_op.so` into `test_resources/library/linux`.
    1. Run `deactivate` to exit the virtualenv