Ignore HMR block for coverage
Ignore HMR block for coverage

A recent commit in nyc started covering index.dev.jsx. The HMR block is only
used for development and we currently don't have a production only mode so we're
ignoring it for coverage. The block will noop in production mode anyway.

NiGhTTraX/react-test-buffet,NiGhTTraX/react-test-buffet,NiGhTTraX/react-test-buffet