fix(deps): update dependency rxjs to v6.6.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rxjs	dependencies	minor	6.5.5 -> 6.6.0

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Release Notes

reactivex/rxjs

v6.6.0

Compare Source

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[codecov]

Codecov Report

Merging #481 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #481   +/-   ##
=======================================
  Coverage   88.45%   88.45%           
=======================================
  Files          80       80           
  Lines        1906     1906           
  Branches      215      215           
=======================================
  Hits         1686     1686           
  Misses        215      215           
  Partials        5        5           

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