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Make the IP loopback check faster

Helps readers understand what they're looking at.

Decapsulate currently allocates a lot and this appears to have been causing some
issues (hard to tell, pprof is misbehaving).

Note: I removed the TODO as this function now *only* checks if we're dealing
with a loopback address. Not sure what `OverIPLoopback` was supposed to mean.

Note 2: Decapsulate actually checked if the IP6 loopback addresses
appeared *anywhere* in the multiadder. However, as we weren't doing this for
IP4, I decided to simplify this and only check prefixes.

use standard travis-ci scripts and enable sudo

This should fix CI.

Supersedes #34.

Added UDP datagram packet connection support.

Signed-off-by: Tom Swindell <t.swindell@rubyx.co.uk>

It is slow and causes queue in whole org.

Check for local ip6 addresses with more flexbility

README/docs: Improved README, make golint happy

Currently IsIPLoopback returns true for any multiaddr starting ip4/127, but only returns true on ip6 addresses that exactly equal ip6/::1. So /ip6/::1/tcp/4001 for example does not return true. Instead we should check whether ip6/::1 is contained in the multiaddr, and to do that I simply decapsulated and checked to see if the result is different. It seems this was not caught by tests as none are present specifically for this function.

License: MIT
Signed-off-by: Hector Sanjuan <code@hector.link>

Edit badges, fix links

Edit badges, fixed https links, added Travis and Codecov, capitalized README, added year to license

Standardized README

See https://github.com/multiformats/multiformats/issues/13

Update README URLs based on HTTP redirects