Updates release.md and verification scripts. (#4417)

Script changes and general tidying from our 0.12.0 release @balopat .

dev_tools/packaging/verify-published-package.sh

@@ -74,27 +74,25 @@ for PYTHON_VERSION in python3; do
     # Prepare.
     CORE_DEPS_FILE="${REPO_ROOT}/cirq-core/requirements.txt"
     GOOGLE_DEPS_FILE="${REPO_ROOT}/cirq-google/requirements.txt"
-    CONTRIB_DEPS_FILE="${REPO_ROOT}/cirq-core/cirq/contrib/contrib-requirements.txt"
+    CONTRIB_DEPS_FILE="${REPO_ROOT}/cirq-core/cirq/contrib/requirements.txt"
     DEV_DEPS_FILE="${REPO_ROOT}/dev_tools/requirements/deps/dev-tools.txt"
 
     echo -e "\n\033[32m${PYTHON_VERSION}\033[0m"
     echo "Working in a fresh virtualenv at ${tmp_dir}/${PYTHON_VERSION}"
     virtualenv --quiet "--python=/usr/bin/${PYTHON_VERSION}" "${tmp_dir}/${PYTHON_VERSION}"
 
-    # Install package.
-    if [ "${PYPI_REPO_NAME}" == "TEST" ]; then
-        echo "Pre-installing dependencies since they don't all exist in TEST pypi"
-        "${tmp_dir}/${PYTHON_VERSION}/bin/pip" install --quiet -r "${CORE_DEPS_FILE}" -r "${GOOGLE_DEPS_FILE}" -r "${DEV_DEPS_FILE}"
-    fi
     echo Installing "${PYPI_PROJECT_NAME}==${PROJECT_VERSION} from ${PYPI_REPO_NAME} pypi"
-    "${tmp_dir}/${PYTHON_VERSION}/bin/pip" install --quiet ${PIP_FLAGS} "${PYPI_PROJECT_NAME}==${PROJECT_VERSION}"
+    "${tmp_dir}/${PYTHON_VERSION}/bin/pip" install --quiet ${PIP_FLAGS} "${PYPI_PROJECT_NAME}==${PROJECT_VERSION}" --extra-index-url https://pypi.python.org/simple
 
     # Check that code runs without dev deps.
     echo Checking that code executes
     "${tmp_dir}/${PYTHON_VERSION}/bin/python" -c "import cirq; print(cirq.google.Foxtail)"
     "${tmp_dir}/${PYTHON_VERSION}/bin/python" -c "import cirq_google; print(cirq_google.Foxtail)"
     "${tmp_dir}/${PYTHON_VERSION}/bin/python" -c "import cirq; print(cirq.Circuit(cirq.CZ(*cirq.LineQubit.range(2))))"
 
+    # Install pytest + dev deps.
+    "${tmp_dir}/${PYTHON_VERSION}/bin/pip" install -r ${DEV_DEPS_FILE}
+
     # Run tests.
     PY_VER=$(ls "${tmp_dir}/${PYTHON_VERSION}/lib")
     echo Running cirq tests

release.md

@@ -186,8 +186,10 @@ Retrieve all commits since the last release with:
 ```git log "--pretty=%h %s"```.
 
 You can get the changes to the top-level objects and protocols by
-checking the history of the
-[init file](https://github.com/quantumlib/Cirq/blob/master/cirq/__init__.py)
+checking the history of the init files. `git diff <previous version>..HEAD cirq-core/cirq/__init__.py`
+
+You can get the contributing authors for the release by running:
+`git log <previous version>..HEAD --pretty="%an" | sort | uniq | sed ':a;N;$!ba;s/\n/, /g'`
 
 
 ### Release to prod pypi