Add twine check to make build.

Should detect errors in the README.rst file.

Signed-off-by: Daniel Lim Wee Soong <weesoong.lim@gmail.com>
Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>

Author: daniellimws

Makefile

@@ -35,7 +35,7 @@ clean: version-clean
 
 # Build and upload commands
 build: $(VERSION_PY) | $(CONDA_ENV_PYTHON)
-	$(IN_CONDA_ENV) python setup.py sdist bdist_wheel
+	$(IN_CONDA_ENV) python setup.py sdist bdist_wheel && twine check dist/*
 
 .PHONY: build