Mention release versions in AST changelog

Not always entirely accurate as versions have been available longer
in "experimental" state, but overall probably more useful than dates
which may be far removed from the release where the version was
actually available.

Author: nikic

README.md

@@ -520,7 +520,7 @@ are listed.
 
 ### 50 (current)
 
-Supported since 2017-07-19.
+Supported since 0.1.5 (2017-07-19).
 
 * `ast\Node\Decl` nodes are no longer generated. AST kinds `AST_FUNC_DECL`, `AST_METHOD`,
   `AST_CLOSURE` and `AST_CLASS` now also use the normal `ast\Node` class. The `name` and
@@ -538,7 +538,7 @@ Supported since 2017-07-19.
 
 ### 45 (deprecated)
 
-Supported since 2017-07-19. Deprecated since 2018-10-06.
+Supported since 0.1.5 (2017-07-19). Deprecated since 0.1.7 (XXX).
 
 This version normalizes the AST to PHP 7.2 format.
 
@@ -547,7 +547,7 @@ This version normalizes the AST to PHP 7.2 format.
 
 ### 40 (deprecated)
 
-Supported since 2017-01-18. Deprecated since 2018-10-06.
+Supported since 0.1.4 (2017-01-25). Deprecated since 0.1.7 (XXX).
 
 * `AST_COALESCE` is now represented as an `AST_BINARY_OP` with flag `BINARY_COALESCE`.
 * For `AST_NAME` nodes with `NAME_FQ` the leading backslash is now dropped if syntax like
@@ -563,7 +563,7 @@ Supported since 2017-01-18. Deprecated since 2018-10-06.
 
 ### 35 (deprecated)
 
-Supported since 2016-08-04. Deprecated since 2017-07-19.
+Supported since 0.1.2 (2016-08-04). Deprecated since 0.1.5 (2017-07-19).
 
 This version normalizes the AST to PHP 7.1 format.
 
@@ -577,13 +577,14 @@ This version normalizes the AST to PHP 7.1 format.
 
 ### 30 (deprecated)
 
-Supported since 2015-03-10. Deprecated since 2017-06-25.
+Supported since 0.1.2 (2016-08-04). Deprecated since 0.1.5 (2017-07-19).
 
 * Use string names for child nodes of kinds with fixed length.
 
 ### 20 (removed)
 
-Supported since 2015-12-14. Deprecated since 2016-08-04. Removed since 2017-01-18.
+Supported since 0.1.0 (2015-12-04). Deprecated since 0.1.2 (2016-08-04).
+Removed since 0.1.4 (2017-01-25).
 
 * `AST_GREATER`, `AST_GREATER_EQUAL`, `AST_OR`, `AST_AND` nodes are now represented using
   `AST_BINARY_OP` with flags `BINARY_IS_GREATER`, `BINARY_IS_GREATER_OR_EQUAL`, `BINARY_BOOL_OR`
@@ -597,15 +598,16 @@ Supported since 2015-12-14. Deprecated since 2016-08-04. Removed since 2017-01-1
 
 ### 15 (removed)
 
-Supported since 2015-10-21. Deprecated since 2016-04-30. Removed since 2016-08-04.
+Supported since 0.1.0 (2015-12-04). Deprecated since 0.1.2 (2016-08-04).
+Removed since 0.1.3 (2017-01-18).
 
 * In line with an upstream change, the `docComment` property on `AST_PROP_DECL` has been moved to
   `AST_PROP_ELEM`. This means that each property in one property declaration can have its own
   doc comment.
 
 ### 10 (removed)
 
-Initial. Removed since 2016-08-04.
+Initial. Deprecated since 0.1.2 (2016-08-04). Removed since 0.1.3 (2017-01-18).
 
 Differences to PHP-Parser
 -------------------------