Use static id for Topic ARN instead of timestamp

[akhilpanchal]

Fixes issue #38

[codecov-io]

Codecov Report

Merging #39 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master      #39   +/-   ##
=======================================
  Coverage   36.36%   36.36%           
=======================================
  Files          21       21           
  Lines         341      341           
  Branches        8        9    +1     
=======================================
  Hits          124      124           
  Misses        217      217

Impacted Files	Coverage Δ
.../main/scala/me/snov/sns/actor/SubscribeActor.scala	0% <0%> (ø)	⬆️

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