Add CHANGELOG entry for #19

CHANGELOG.md

@@ -18,6 +18,16 @@ _None_
   to do the equivalent of the `result = someArray.map { item in … }` Swift code.  
   [David Jennes](https://github.com/djbe)
   [#11](https://github.com/SwiftGen/StencilSwiftKit/pull/11)
+* Add a "parameters parser" able to transform parameters passed as a set of strings
+  (`a=1 b.x=2 b.y=3 c=4 c=5`) — typically provided as the command line arguments of a CLI
+   — into a Dictionary suitable for Stencil contexts.  
+  [David Jennes](https://github.com/djbe)
+  [#8](https://github.com/SwiftGen/StencilSwiftKit/pull/8)
+* Add a `StencilContext.enrich` function to enrich Stencil contexts with `param` and `env` dictionaries.  
+  The `param` dictionary typically contains parameters parsed via the parameters parser above.  
+  The `env` dictionary contains all the environment variables. You can thus access them in
+  your templates using `env.USER`, `env.LANG`, `env.PRODUCT_MODULE_NAME`, etc.  
+  [#19](https://github.com/SwiftGen/StencilSwiftKit/pull/19)
 
 ### Internal Changes
 
@@ -30,9 +40,6 @@ _None_
 * Refactor stencil node tests to not use templates and output files.  
   [David Jennes](https://github.com/djbe)
   [#17](https://github.com/SwiftGen/StencilSwiftKit/issues/17)
-* Add a "parameters parser" able to transform parameters passed as a set of strings (`a=1 b.x=2 b.y=3 c=4 c=5`) — typically provided as the command line arguments of a CLI — into a Dictionary suitable for Stencil contexts.  
-  [David Jennes](https://github.com/djbe)
-  [#8](https://github.com/SwiftGen/StencilSwiftKit/pull/8)
 
 ## Pre-1.0.0