`cids` should be a dependency, not a devDependency

[rrthomas]

The module cids is required by src/utils/persist.js.

I found this problem because of hitting an error exactly like this one, which was caused by an old version of cids, which is required by web3, happening to be the version in the top level of my project's node_modules.

Thanks for IPFS!

[achingbrain]

Nice spot, thanks for opening this. It should be fixed in ipfs-unixfs-importer@6.0.0 and above. It'll get rolled into IPFS as part of ipfs/js-ipfs#3550 and shipped in the next release.

[rrthomas]

Thanks for the quick fix, @achingbrain!