Hard-coded StepperLayout's orientation to VERTICAL

[zawadz88]

This is a fix for issue #124

[codecov-io]

Codecov Report

Merging #126 into master will increase coverage by 0.18%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #126      +/-   ##
============================================
+ Coverage     46.37%   46.55%   +0.18%     
- Complexity      113      114       +1     
============================================
  Files            24       24              
  Lines           882      885       +3     
  Branches         85       85              
============================================
+ Hits            409      412       +3     
  Misses          409      409              
  Partials         64       64

Impacted Files	Coverage Δ	Complexity Δ
...main/java/com/stepstone/stepper/StepperLayout.java	34.64% <100%> (+0.64%)	18 <1> (+1)	⬆️

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