Remove npm-shrinkwrap.json, as new versions of npm stopped referencing devDependencies in it

Author: kaelig

Makefile

@@ -2,17 +2,14 @@ updatedependencies:
 	@echo "How to add or remove npm dependencies:"
 	@echo "https://github.com/salesforce-ux/design-system-internal/wiki/How-to-install-or-remove-npm-dependencies"
 	npm cache clear
-	rm -f npm-shrinkwrap.json
 	rm -Rf node_modules
 	# Remove this next line when this issue is fixed:
 	# https://github.com/dequelabs/axe-webdriverjs/issues/17
 	npm install axe-core@^2.0.7
 	npm install
-	npm shrinkwrap
-	clingwrap npmbegone
 	npm run build
 	npm test
-	git add npm-shrinkwrap.json package.json
+	git add package.json
 	@echo "Dependency tree updated!"
 	@echo "To commit, type: git commit -m 'Update dependencies'"