Fix/enotfound with non standard port

[lmammino]

Fixes #11

[codecov]

Codecov Report

Merging #12 into master will decrease coverage by 5%.
The diff coverage is 93.75%.

@@         Coverage Diff          @@
##           master   #12   +/-   ##
====================================
- Coverage     100%   95%   -5%     
====================================
  Files           1     1           
  Lines          15    20    +5     
  Branches        3     5    +2     
====================================
+ Hits           15    19    +4     
- Misses          0     1    +1

Impacted Files	Coverage Δ
src/index.js	95% <93.75%> (-5%)	⬇️

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[lmammino]

Hello @alexdpoon can you please validate that these changes fix the issue you reported in #11 ?

Thanks :)