Fix R code in Readme

[gowerc]

Partially resolves #242 - Though it stops short in that I couldn't find any obvious existing IDR workflow that could automate checking this for us. I did add a VScode task that gets automatically run every time before I submit a PR so hopefully at least the odds of this happening again from myself and significantly reduced. I'm guessing for now this is enough to knock #242 off of the "initial release" milestone.

[github-actions]

Code Coverage Summary

Filename                       Stmts    Miss  Cover    Missing
---------------------------  -------  ------  -------  ----------------------
R/DataJoint.R                     76       2  97.37%   264, 270
R/DataLongitudinal.R             119       1  99.16%   245
R/DataSubject.R                   69       1  98.55%   123
R/DataSurvival.R                  74       1  98.65%   145
R/defaults.R                      13       7  46.15%   27, 45-84, 111
R/generics.R                      15       1  93.33%   69
R/JointModel.R                    91       8  91.21%   113-125, 204, 210, 216
R/JointModelSamples.R             54       0  100.00%
R/Link.R                          18       0  100.00%
R/LinkGSF.R                       69      13  81.16%   116-128
R/LinkNone.R                       5       1  80.00%   36
R/LinkRandomSlope.R               11       0  100.00%
R/LongitudinalGSF.R               24       0  100.00%
R/LongitudinalModel.R             17       0  100.00%
R/LongitudinalQuantities.R        85       8  90.59%   100-107
R/LongitudinalRandomSlope.R       22       0  100.00%
R/Parameter.R                     14       0  100.00%
R/ParameterList.R                 37       1  97.30%   175
R/Prior.R                        117       0  100.00%
R/Quantities.R                   105       0  100.00%
R/simulations_gsf.R               43       0  100.00%
R/simulations_os.R                11       5  54.55%   35-39
R/simulations_rs.R                21       0  100.00%
R/simulations.R                   99       1  98.99%   122
R/StanModel.R                     14       0  100.00%
R/StanModule.R                   158       4  97.47%   197-198, 240, 251
R/SurvivalExponential.R           10       0  100.00%
R/SurvivalLoglogistic.R           11       0  100.00%
R/SurvivalModel.R                 19       0  100.00%
R/SurvivalQuantities.R           119       6  94.96%   173-178
R/SurvivalWeibullPH.R             11       0  100.00%
R/utilities.R                    145       1  99.31%   13
R/zzz.R                           11      11  0.00%    4-29
TOTAL                           1707      72  95.78%

Diff against main

Filename      Stmts    Miss  Cover
----------  -------  ------  --------
TOTAL             0       0  +100.00%

Results for commit: 3429b42

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results

[github-actions]

Unit Tests Summary

    1 files    33 suites   5m 28s ⏱️
  88 tests   64 ✔️ 24 💤 0 ❌
301 runs  277 ✔️ 24 💤 0 ❌

Results for commit 3429b42.