Adding rounding to fix lines of individual plot when finegrid=FALSE

[tynsci]

Fixes #200

• see comments in issue before merging (assumes that predictions$TIME values are always rounded)

[codecov-commenter]

Codecov Report

Merging #227 (3277bdd) into master (e39847f) will increase coverage by 0.03%.
The diff coverage is 76.92%.

@@            Coverage Diff             @@
##           master     #227      +/-   ##
==========================================
+ Coverage   71.72%   71.76%   +0.03%     
==========================================
  Files          45       45              
  Lines        3983     3988       +5     
==========================================
+ Hits         2857     2862       +5     
  Misses       1126     1126              

Impacted Files	Coverage Δ
R/nlmixr.R	66.66% <66.66%> (-0.99%)	⬇️
R/plot-individual.R	92.18% <100.00%> (+0.06%)	⬆️
R/plot-residual.R	83.75% <0.00%> (+3.75%)	⬆️

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