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@takluyver let me know if this is good to merge.

I think this paragraph should be expanded to talk about the i686 image as well, now that one has been created. As described in #1204, the x86_64 image has devtoolset 8, while the i686 one has devtoolset 7.

I also wouldn't say 'fully new' - that implies it's the latest version, which I don't think it is. Maybe the key point is that it's a newer compiler toolchain than would have been available when CentOS 6 was released in 2010.

@mayeut and @veblush might be better able to help with this - I'm not closely involved with the docker images.