chore: bump to release version 1.7.0

DESCRIPTION

 Package: airGR
 Type: Package
 Title: Suite of GR Hydrological Models for Precipitation-Runoff Modelling
-Version: 1.6.12.9001
+Version: 1.7.0
 Date: 2022-02-21
 Authors@R: c(
   person("Laurent", "Coron", role = c("aut", "trl"), comment = c(ORCID = "0000-0002-1503-6204")),

NEWS.md

@@ -2,7 +2,7 @@
 
 
 
-### 1.6.12.9001 Release Notes (2022-02-21)
+### 1.7.0 Release Notes (2022-02-21)
 
 #### New features
 
@@ -28,6 +28,7 @@
 
 
 #### Major user-visible changes
+
 - `RunModel_Lag()` now handles warm-up period simulation (set in `CreateRunOptions()`). ([#132](https://gitlab.irstea.fr/HYCAR-Hydro/airgr/-/issues/132))