Update changelog, refs #778

docs/pages/release_notes.md

@@ -14,6 +14,7 @@ This is a minor release.
 
 * [New and noteworthy](#new-and-noteworthy)
     *   [Tree transversal revision](#tree-transversal-revision)
+    *   [Swift 4.1 Support](#swift-41-support)
 * [Fixed Issues](#fixed-issues)
 * [API Changes](#api-changes)
 * [External Contributions](#external-contributions)
@@ -32,16 +33,32 @@ This change implies several false positives / unexpected results (ie: `ASTBlockS
 have been fixed; and lots of searches are now restricted to smaller search areas, which improves performance (depending on the project,
 we have measured up to 10% improvements during Type Resolution, Symbol Table analysis, and some rule's application).
 
+#### Swift 4.1 Support
+
+Thanks to major contributions from [kenji21](https://github.com/kenji21) the Swift grammar has been updated to support Swift 4.1.
+This is a major update, since the old grammar was quite dated, and we are sure all iOS developers will enjoy it.
+
+Unfortunately, this change is not compatible. The grammar elements that have been removed (ie: the keywords `__FILE__`,
+`__LINE__`, `__COLUMN__` and `__FUNCTION__`) are no longer supported. We don't usually introduce such drastic / breaking
+changes in minor releases, however, given that the whole Swift ecosystem pushes hard towards always using the latest
+versions, and that Swift needs all code and libraries to be currently compiling against the same Swift version,
+we felt strongly this change was both safe and necessary to be shipped as soon as possible. We had great feedback
+from the comunity during the processm but if you have a legitimate use case for older Swift versions, please let us know
+[on our Issue Tracke](https://github.com/pmd/pmd/issues).
+
 ### Fixed Issues
 
 *   documentation
     *   [#994](https://github.com/pmd/pmd/issues/994): \[doc] Delete duplicate page contributing.md on the website
 *   java-bestpracrtices
     *   [#370](https://github.com/pmd/pmd/issues/370): \[java] GuardLogStatementJavaUtil not considering lambdas
+*   swift
+    *   [#678](https://github.com/pmd/pmd/issues/678): \[swift][cpd] Exception when running for Swift 4 code (KeyPath)
 
 ### API Changes
 
 ### External Contributions
 
+*   [#778](https://github.com/pmd/pmd/pull/778): \[swift] Support Swift 4 grammar - [kenji21](https://github.com/kenji21)
 *   [#1002](https://github.com/pmd/pmd/pull/1002): \[doc] Delete duplicate page contributing.md on the website - [Ishan Srivastava](https://github.com/ishanSrt)
 *   [#1008](https://github.com/pmd/pmd/pull/1008): \[core] DOC: fix closing tag for <pmdVersion> - [stonio](https://github.com/stonio)