Actually print the invalid properties

[arturbosch]

Fixes detekt/detekt-intellij-plugin#96

[codecov]

Codecov Report

Merging #2955 into master will decrease coverage by 0.02%.
The diff coverage is 57.14%.

@@             Coverage Diff              @@
##             master    #2955      +/-   ##
============================================
- Coverage     80.26%   80.24%   -0.03%     
  Complexity     2455     2455              
============================================
  Files           422      422              
  Lines          7414     7420       +6     
  Branches       1356     1357       +1     
============================================
+ Hits           5951     5954       +3     
- Misses          760      762       +2     
- Partials        703      704       +1     

Impacted Files	Coverage Δ	Complexity Δ
.../arturbosch/detekt/core/config/ConfigValidators.kt	81.25% <57.14%> (-18.75%)	0.00 <0.00> (ø)

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