chore: bump to release version 0.1.4 and add NEWS file

DESCRIPTION

 Package: airGRdatassim
 Type: Package
 Title: Ensemble-Based Data Assimilation with GR Hydrological Models
-Version: 0.1.3.9000
-Date: 2021-02-11
+Version: 0.1.4
+Date: 2025-04-04
 Authors@R: c(
   person("Gaia", "Piazzi", role = c("aut"), comment = c(ORCID = "0000-0002-4167-0794")),
   person("Olivier", "Delaigue", role = c("aut", "cre"), comment = c(ORCID = "0000-0002-7668-8468"), email = "airGR@inrae.fr"),

NEWS.md

+## Release History of the airGRdatassim Package
+
+
+
+
+
+### 0.1.4 Release Notes (2025-04-04)
+
+#### User-visible changes
+
+- update article reference in the CITATION file ([#3](https://gitlab.irstea.fr/HYCAR-Hydro/airgrdatassim/-/issues/3))
+- update DOI of the manual reference in the CITATION file ([#26](https://gitlab.irstea.fr/HYCAR-Hydro/airgrdatassim/-/issues/26))
+
+#### Version control and issue tracking
+
+- now use a R docker image for CI/CD runner ([#23](https://gitlab.irstea.fr/HYCAR-Hydro/airgrdatassim/-/issues/23))
+
+#### CRAN-compatibility updates
+
+- now suggests 'markdown' ([#22](https://gitlab.irstea.fr/HYCAR-Hydro/airgrdatassim/-/issues/22))
+- replace the use of `personList()` by `c()` in the CITATION file ([#25](https://gitlab.irstea.fr/HYCAR-Hydro/airgrdatassim/-/issues/25))
+- add missing 'airGR' target in the 'airGRdatassim-package' help page ([#27](https://gitlab.irstea.fr/HYCAR-Hydro/airgrdatassim/-/issues/27))