Added version 1.20.0 CHANGES.

CHANGES

@@ -1,4 +1,49 @@
 
+Changes with Unit 1.20.0                                         08 Oct 2020
+
+    *) Change: the PHP module is now initialized before chrooting; this
+       enables loading all extensions from the host system.
+
+    *) Change: AVIF and APNG image formats added to the default MIME type
+       list.
+
+    *) Feature: the Python module now fully supports applications that use
+       the ASGI 3.0 server interface.
+
+    *) Feature: the Python module now has a built-in WebSocket server
+       implementation for applications, compatible with the HTTP & WebSocket
+       ASGI Message Format 2.1 specification.
+
+    *) Feature: automatic mounting of an isolated "/tmp" file system into
+       chrooted application environments.
+
+    *) Feature: the $host variable contains a normalized "Host" request
+       value.
+
+    *) Feature: the "callable" option sets Python application callable
+       names.
+
+    *) Feature: compatibility with PHP 8 RC 1. Thanks to Remi Collet.
+
+    *) Feature: the "automount" option in the "isolation" object allows to
+       turn off the automatic mounting of language module dependencies.
+
+    *) Bugfix: "pass"-ing requests to upstreams from a route was broken; the
+       bug had appeared in 1.19.0. Thanks to 洪志道 (Hong Zhi Dao) for
+       discovering and fixing it.
+
+    *) Bugfix: the router process could crash during reconfiguration.
+
+    *) Bugfix: a memory leak occurring in the router process; the bug had
+       appeared in 1.18.0.
+
+    *) Bugfix: the "!" (non-empty) pattern was matched incorrectly; the bug
+       had appeared in 1.19.0.
+
+    *) Bugfix: fixed building on platforms without sendfile() support,
+       notably NetBSD; the bug had appeared in 1.16.0.
+
+
 Changes with Unit 1.19.0                                         13 Aug 2020
 
     *) Feature: reworked IPC between the router process and the applications