v1.0.9.51 new NEWS.Rd file with a link to the airGR website News page

DESCRIPTION

 Package: airGR
 Type: Package
 Title: Suite of GR Hydrological Models for Precipitation-Runoff Modelling
-Version: 1.0.9.50
+Version: 1.0.9.51
 Date: 2017-10-17
 Authors@R: c(
   person("Laurent", "Coron", role = c("aut", "trl")),

NEWS.rmd

@@ -14,7 +14,7 @@ output:
 
 
 
-### 1.0.9.50 Release Notes (2017-10-17) 
+### 1.0.9.51 Release Notes (2017-10-17) 
 
 #### New features
 

inst/NEWS.Rd

+\name{NEWS}
+\title{News for Package 'airGR'}
+
+\section{CHANGES IN airGR VERSION 999.999}{
+  \itemize{
+    \item This NEWS file is only a placeholder. The version 999.999 does not really
+    exist. Please read the airGR website: \url{https://odelaigue.github.io/airGR/NEWS.html}
+  }
+}
\ No newline at end of file