Removed rxjs as a dependency.

[angelnikolov]

Fixes #125

[codecov]

Codecov Report

Base: 76.99% // Head: 76.99% // No change to project coverage 👍

Coverage data is based on head (5789205) compared to base (004c1c9).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #127   +/-   ##
=======================================
  Coverage   76.99%   76.99%           
=======================================
  Files          13       13           
  Lines         326      326           
  Branches       83       83           
=======================================
  Hits          251      251           
  Misses         60       60           
  Partials       15       15           

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