Updated Readme to clarify nested route sequences

[jnes92]

I also noticed the same problem like issue #274:

#274

So I decided to add some text to the readme :)

[codecov]

Codecov Report

Merging #286 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #286   +/-   ##
=======================================
  Coverage   98.61%   98.61%           
=======================================
  Files          28       28           
  Lines         362      362           
=======================================
  Hits          357      357           
  Misses          5        5

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