Adds a function to safely compute log.

[PavelBal]

Increases version number to 1.5

Fixes #126

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 :tada:

Comparison is base (83eec74) 99.50% compared to head (2f2b34f) 99.52%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #127 +/- ## =========================================== + Coverage 99.50% 99.52% +0.01% =========================================== Files 18 18 Lines 202 210 +8 =========================================== + Hits 201 209 +8 Misses 1 1 ``` | [Impacted Files](https://codecov.io/gh/Open-Systems-Pharmacology/OSPSuite.RUtils/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Open-Systems-Pharmacology) | Coverage Δ | | |---|---|---| | [R/ospsuite.utils-env.R](https://codecov.io/gh/Open-Systems-Pharmacology/OSPSuite.RUtils/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Open-Systems-Pharmacology#diff-Ui9vc3BzdWl0ZS51dGlscy1lbnYuUg==) | `83.33% <ø> (ø)` | | | [R/utilities-validation.R](https://codecov.io/gh/Open-Systems-Pharmacology/OSPSuite.RUtils/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Open-Systems-Pharmacology#diff-Ui91dGlsaXRpZXMtdmFsaWRhdGlvbi5S) | `100.00% <100.00%> (ø)` | | | [R/utilities.R](https://codecov.io/gh/Open-Systems-Pharmacology/OSPSuite.RUtils/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Open-Systems-Pharmacology#diff-Ui91dGlsaXRpZXMuUg==) | `100.00% <100.00%> (ø)` | | | [R/validation-type.R](https://codecov.io/gh/Open-Systems-Pharmacology/OSPSuite.RUtils/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Open-Systems-Pharmacology#diff-Ui92YWxpZGF0aW9uLXR5cGUuUg==) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Open-Systems-Pharmacology). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Open-Systems-Pharmacology)

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[Yuri05]

need to add logSafe to _pkgdown.yml topics list. After that: looks good for me.