Fix error try_to_run using | without shell=True (fix #284)

[paugier]

With ['hg', 'log', '-r', '.', '-T', '{node}'] to avoid shell=True.

Should fix #284

[codecov]

Codecov Report

Merging #298 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #298   +/-   ##
=====================================
  Coverage      88%    88%           
=====================================
  Files           2      2           
  Lines           9      9           
=====================================
  Hits            8      8           
  Misses          1      1           

[thomasrockhu]

Thanks for this @paugier!