Update NEWS with addition of Prem et al 2021

Author: Bisaloo

NEWS.md

@@ -1,3 +1,28 @@
+# contactdata 1.0.0
+
+## New features
+
+The updated data from Prem et al. (2021) has been added (#4). This results in a 
+large number of cascading changes, including some breaking changes, detailed 
+below.
+
+### Breaking changes
+
+* The new default returns data from the updated dataset. This means that any
+re-run of code written with previous versions of contactdata will return a 
+different result
+* Arguments in `contact_df_countries()` have been removed and replaced by `...`
+to increase flexibility. This is only an interface change and does not modify
+the behaviour since all arguments were already forwarded to `contact_matrix()`.
+
+### Non-breaking changes
+
+* `list_countries()` and `contact_matrix()` now have two additional arguments:
+  - `geographic_setting`, which specifies if you'd like to get the contact data
+    from a `"rural"`, `"urban"` setting, or from `"all"` settings.
+  - `data_source`, which indicates if the data should be extracted from Prem et
+    al. (2017) or Prem et al. (2021)
+
 # contactdata 0.2
 
 * Addition of a new function `age_df_countries()` to get population