For my current project, I don't need counties and I just wanted a smaller topojson file of the US. This pull request adds a makefile target for such a file and adds it to the README.
Question: I don't think I need a topojson-merge step (I tried, and it didn't prune anything). Is that accurate?
I chose the simplest, most descriptive name I could think of, but I'm not overwhelmingly happy with it. Would be happy to change the target's name.
For my current project, I don't need counties and I just wanted a smaller topojson file of the US. This pull request adds a makefile target for such a file and adds it to the README.