Update readme

[mdiephuis]

Fixed a tiny error in the random walk example output.

[rusty1s]

Hi and thank you, but the random walk output is non-deterministic, so both variants should be correct :)

[codecov-io]

Codecov Report

Merging #50 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #50   +/-   ##
=======================================
  Coverage   99.29%   99.29%           
=======================================
  Files           8        8           
  Lines         141      141           
=======================================
  Hits          140      140           
  Misses          1        1

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[mdiephuis]

Ok, I just expected the number of returned walks, or size(0) of the returned tensor to be identical in number to the number of indices passed in start.

[rusty1s]

Oh, you are right. This is an error!