Update URL extractor to pull from PMC id in record header
Update URL extractor to pull from PMC id in record header

icereval/scrapi,ostwald/scrapi,CenterForOpenScience/scrapi,jeffreyliu3230/scrapi,fabianvf/scrapi,mehanig/scrapi,alexgarciac/scrapi,felliott/scrapi,erinspace/scrapi,felliott/scrapi,mehanig/scrapi,CenterForOpenScience/scrapi,erinspace/scrapi,fabianvf/scrapi