merge Upstream v0.2.4

[xiegeo]

Upstream had breaking changes.

• IsProtected was added in Connection Manager: add IsProtected interface libp2p/go-libp2p-core#158
• opts ...Option was added to NewConnManager in implement decaying tags. libp2p/go-libp2p-connmgr#61. This actually not breaking as it's an optional perimeter.

[codecov]

Codecov Report

Merging #22 into master will decrease coverage by 4.72%.
The diff coverage is 82.16%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
- Coverage   93.60%   88.89%   -4.71%     
==========================================
  Files           1        3       +2     
  Lines         250      450     +200     
==========================================
+ Hits          234      400     +166     
- Misses         13       43      +30     
- Partials        3        7       +4     

Impacted Files	Coverage Δ
connmgr.go	90.65% <65.86%> (-2.95%)	⬇️
decay.go	85.72% <85.72%> (ø)
options.go	100.00% <100.00%> (ø)

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[bonedaddy]

looks good