Fix think ability

[olistic]

Previously, warrior.think({ foo: 'bar' }) printed Spartacus thinks [object Object]. This PR fixes that, plus makes the behavior of warrior.think() almost the same as console.log().

[codecov-io]

Codecov Report

Merging #220 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage   92.64%   92.64%   +<.01%     
==========================================
  Files          92       92              
  Lines        1087     1088       +1     
  Branches      165      165              
==========================================
+ Hits         1007     1008       +1     
  Misses         65       65              
  Partials       15       15

Impacted Files	Coverage Δ
packages/warriorjs-abilities/src/think.js	100% <100%> (ø)	⬆️

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