Update CHANGELOG for 0.7.0
Update CHANGELOG for 0.7.0

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