Fix bug with negative time limits

[odow]

x-ref: chriscoey/MOIPajarito.jl#12

[codecov]

Codecov Report

Merging #202 (6ec90d9) into master (5982ae9) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #202   +/-   ##
=======================================
  Coverage   82.85%   82.85%           
=======================================
  Files           9        9           
  Lines        1761     1761           
=======================================
  Hits         1459     1459           
  Misses        302      302           

Impacted Files	Coverage Δ
src/MOI_wrapper/MOI_wrapper.jl	92.04% <100.00%> (ø)

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