refactor(variable): Deprecate whitespace in filters

CHANGELOG.md

@@ -21,7 +21,6 @@
 
   - let template = loader.loadTemplate(name: "index.html")
   - try template.render(Context(dictionary: ["loader": loader]))
-
   + let environment = Environment(loader: loader)
   + try environment.renderTemplate(name: "index.html")
   ```
@@ -55,6 +54,13 @@
 - `Template` initialisers have been deprecated in favour of using a template
   loader such as `FileSystemLoader` inside an `Environment`.
 
+- The use of whitespace inside variable filter expression is now deprecated.
+
+  ```diff
+  - {{ name | uppercase }}
+  + {{ name|uppercase }}
+  ```
+
 
 ## 0.7.1