Fix routing method (#188)

[ondrejchmelar]

fixes #188

[codecov-commenter]

Codecov Report

Merging #191 (3e042a8) into master (c1a6b0e) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #191   +/-   ##
=======================================
  Coverage   94.51%   94.51%           
=======================================
  Files         100      100           
  Lines       10631    10631           
  Branches     1202     1202           
=======================================
  Hits        10048    10048           
  Misses        514      514           
  Partials       69       69           

Impacted Files	Coverage Δ
faust/app/router.py	100.00% <100.00%> (ø)

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