Citation updated

inst/CITATION

-citHeader("To cite airGR in publications use these references:")
+citHeader("To cite airGR in publications use these two references:")
 
 citEntry(entry="Article",
 	title = "airGR: A suite of lumped 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 = "in prep.",       
+  	year = "submitted",       
         textVersion = 
-        paste("Coron, L., Thirel, G., Delaigue, O., Perrin, C. and Andréassian, V. ",
-	       "(in prep.). ", 
-               "airGR: A suite of lumped hydrological models in an R-package. ",
-               "Environmental Modelling and software. ",
-               sep="")
+        paste("Coron, L., Thirel, G., Delaigue, O., Perrin, C. and Andréassian, V.",
+	          "(submitted).", 
+              "airGR: A suite of lumped hydrological models in an R-package.",
+              "Environmental Modelling and software.",
+              sep = " ")
          )
 
 citEntry(entry="Manual",
@@ -21,10 +21,10 @@ citEntry(entry="Manual",
     note = "R package version 1.0.3",
     url = "https://webgr.irstea.fr/airGR/?lang=en",
         textVersion = 
-        paste("Coron, L., Perrin, C. and Michel, C. ",
-	       "(2016). ", 
-               "airGR: Suite of GR hydrological models for precipitation-runoff modelling. ",
-               "R package version 1.0.3",
-               "https://webgr.irstea.fr/airGR/?lang=en",
-               sep="")
+        paste("Coron, L., Perrin, C. and Michel, C.",
+			  "(2016).", 
+              "airGR: Suite of GR hydrological models for precipitation-runoff modelling.",
+              "R package version 1.0.3.",
+              "https://webgr.irstea.fr/airGR/?lang=en.",
+              sep = " ")
          )