chore(CITATION): format package references

inst/CITATION

@@ -5,37 +5,38 @@ note    <- sprintf("R package version %s", version)
 
 citHeader("To cite airGR in publications use these two references:")
 
-bibentry(bibtype="Article",
-         title = "The Suite of Lumped {GR} Hydrological Models in an {R} package",
-         author = personList(as.person("L. Coron"), as.person("G. Thirel"), as.person("O. Delaigue"), as.person("C. Perrin"), as.person("V. Andréassian")),
+bibentry(bibtype ="Article",
+         title   = "The Suite of Lumped {GR} Hydrological Models in an {R} package",
+         author  = personList(as.person("L. Coron"), as.person("G. Thirel"), as.person("O. Delaigue"), as.person("C. Perrin"), as.person("V. Andréassian")),
          journal = "Environmental Modelling and Software",
-         year = "2017",
-         pages = {"166-171"},
-         volume = {94},
-         doi = "10.1016/j.envsoft.2017.05.002",
+         year    = "2017",
+         pages   = {"166-171"},
+         volume  = {94},
+         doi     = "10.1016/j.envsoft.2017.05.002",
          textVersion =
            paste("Coron, L., Thirel, G., Delaigue, O., Perrin, C. and Andréassian, V.",
                  "(2017).",
                  "The Suite of Lumped GR Hydrological Models in an R package.",
                  "Environmental Modelling and Software,",
-                 "94, 166-171.",
-                 "DOI: 10.1016/j.envsoft.2017.05.002.",
+                 "94, 166-171,",
+                 "doi: 10.1016/j.envsoft.2017.05.002.",
                  sep = " ")
 )
 
-bibentry(bibtype="Manual",
-         title = "{airGR}: Suite of {GR} Hydrological Models for Precipitation-Runoff Modelling",
-         author = personList(as.person("L. Coron"), as.person("O. Delaigue"), as.person("G. Thirel"), as.person("D. Dorchies"), as.person("C. Perrin"), as.person("C. Michel")),
-         journal = "R News",
-         year = year,
-         note = note,
-         doi = "10.15454/EX11NA",
-         url = "https://CRAN.R-project.org/package=airGR",
+bibentry(bibtype     = "Manual",
+         title       = "{airGR}: Suite of {GR} Hydrological Models for Precipitation-Runoff Modelling",
+         author      = personList(as.person("L. Coron"), as.person("O. Delaigue"), as.person("G. Thirel"), as.person("D. Dorchies"), as.person("C. Perrin"), as.person("C. Michel")),
+         journal     = "R News",
+         year        = year,
+         note        = note,
+         doi         = "10.15454/EX11NA",
+         url         = "https://CRAN.R-project.org/package=airGR",
          textVersion =
            paste0("Coron, L., Delaigue, O., Thirel, G., Dorchies, D., Perrin, C. and Michel, C. (",
                   year,
                   "). airGR: Suite of GR Hydrological Models for Precipitation-Runoff Modelling. ",
-                  note,
-                  ". DOI: 10.15454/EX11NA. URL: https://CRAN.R-project.org/package=airGR."
+                  note, ", ",
+                  "doi: 10.15454/EX11NA", ", ",
+                  "URL: https://CRAN.R-project.org/package=airGR."
                   )
 )