zmq4: resend subscriptions in socket.addConn

[thielepaul]

Fixes #116

[codecov[bot]]

Codecov Report

Merging #128 (e092dc6) into main (16d169c) will decrease coverage by 0.11%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #128      +/-   ##
==========================================
- Coverage   67.53%   67.41%   -0.12%     
==========================================
  Files          29       29              
  Lines        1814     1817       +3     
==========================================
  Hits         1225     1225              
- Misses        489      491       +2     
- Partials      100      101       +1     

Impacted Files	Coverage Δ
socket.go	83.23% <100.00%> (+0.19%)	:arrow_up:
sub.go	76.92% <100.00%> (+0.45%)	:arrow_up:
conn.go	55.17% <0.00%> (-1.15%)	:arrow_down:

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[thielepaul]

@sbinet I don't understand how the coverage in conn.go is reduced by my changes, do you understand what is going on there?

[sbinet]

code coverage (with codecov) can be a bit flaky, in my experience.

[sbinet]

needs https://github.com/go-zeromq/license/pull/12

[sbinet]

thanks again (and welcome!)