handle only one temporal window in temporalCovariateSettings

[ginberg]

see #200 The error happens in the Java function 'createSql'; it can't handle if the temporalEndDays is a single value. At first we thought we should add a check in the createTemporalCovariateSettings function (and a couple of related function) so that the user needs to provide a list in case of a single value. But after looking into it, I found that we can solve it in the Java code and so we don't need to make any (possibly breaking) changes.

Also, I have updated the json jar, since we recently updated the version in the pom file. See https://github.com/OHDSI/FeatureExtraction/pull/217

[codecov[bot]]

Codecov Report

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

Project coverage is 93.01%. Comparing base (7a758ab) to head (6b322cd).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #234 +/- ## ======================================== Coverage 93.01% 93.01% ======================================== Files 16 16 Lines 1417 1417 ======================================== Hits 1318 1318 Misses 99 99 ```

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