fix #132

[godcong]

this PR makes when the local update fail, try to get the remote update file.

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[Stebalien]

One comment on the timeout, otherwise LGTM.

[Stebalien]

Can we set this to ~5 minutes? The ideal solution would be to bail if we aren't making progress instead of setting a hard cutoff, but that's going to be a bit harder to do (although you're welcome to try to implement that).

Unfortunately, a 3m cutoff will make it impossible to update IPFS on a 1Mbps connection.

[godcong]

@Stebalien yes,i changed the commit.