update version to 1.5.0

[bvdmitri]

This PR includes a various changes for the next version of Rocket.

[codecov-commenter]

Codecov Report

Base: 78.08% // Head: 78.11% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (a663a1f) compared to base (7ddfc6a).
Patch coverage: 81.81% of modified lines in pull request are covered.

❗ Current head a663a1f differs from pull request most recent head ec35385. Consider uploading reports for the commit ec35385 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
+ Coverage   78.08%   78.11%   +0.02%     
==========================================
  Files         117      119       +2     
  Lines        3569     3601      +32     
==========================================
+ Hits         2787     2813      +26     
- Misses        782      788       +6     

Impacted Files	Coverage Δ
src/Rocket.jl	100.00% <ø> (ø)
src/actor/circularkeep.jl	72.22% <72.22%> (ø)
src/observable/labeled.jl	90.00% <90.00%> (ø)
src/actor/test.jl	80.64% <100.00%> (+0.28%)	⬆️

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