use exclamation mark for increment operations

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (f39deaa) 96.57% compared to head (f536913) 96.57%. Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #303 +/- ## ========================================== - Coverage 96.57% 96.57% -0.01% ========================================== Files 15 15 Lines 1052 1051 -1 ========================================== - Hits 1016 1015 -1 Misses 36 36 ```

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[github-actions[bot]]

Package name	latest	stable
CaNNOLeS.jl
DCISolver.jl
FletcherPenaltySolver.jl
JSOSolvers.jl
Krylov.jl
NLPModels.jl
NLPModelsModifiers.jl
PROPACK.jl
Percival.jl
QuadraticModels.jl
SolverTools.jl