Update Strman.java

[dww619]

Add validate for pad in rightPad.

[codecov-io]

Codecov Report

Merging #98 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #98      +/-   ##
============================================
- Coverage     98.88%   98.85%   -0.03%     
- Complexity      212      213       +1     
============================================
  Files             3        3              
  Lines          4203     4204       +1     
  Branches         57       57              
============================================
  Hits           4156     4156              
  Misses           24       24              
- Partials         23       24       +1

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/strman/Strman.java	87.25% <ø> (-0.25%)	211 <0> (+1)

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[shekhargulati]

@dww619 can you help me understand why you did that? Also, can you fix the failing test cases?