Maintenance (2nd try)

[piegamesde]

Updated dependencies. Closes #91, #92, #100, #101.

Updated README:

• Updated old repository links from before the move to the organization
• Updated all badges as well
• Removed the "percentage of open issues" badge. IMO this metric does not offer any useful insights over the maintenance status of a project.
• Removed Circle CI badge

Applied rustfmt, with the option to merge imports enabled. Now that it is about to get stabilized, I think it's okay to do this.

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Closes #102, which was done from the wrong source.