added changelog for 4.1.5 from 4.1_bugfix branch

extra/CHANGES.txt

@@ -1,3 +1,22 @@
+2020-12-31 4.1.5:
+
+	General improvements:
+
+	all : added an argument to `haxe.CallStack.exceptionStack` to return full stack up to the topmost call (#9947)
+	php : compatibility with PHP 8
+
+	Bugfixes:
+
+	all : fixed empty object declarations in array comprehension (#9971)
+	jvm : fixed equality checks for `Null<Float>` and `Null<Int>` (#9897)
+	hl : fixed crash if a thread finishes without invoking `sendMessage`/`readMessage` (#9920)
+	php : fixed local vars with certain names (_SERVER, _GET etc) overriding super global values (#9924)
+	php : fixed generation with directories in `-D php-front`. For example `-D php-front=sub/index.php` (#10037)
+	macro : added return type hint to haxe.macro.MacroStringTools.formatString (#9928)
+	cs : fixed catching exceptions from static closures (#9957)
+	eval : fixed `Std.random(arg)` for `arg` values of more than 30 bits (#9974)
+	js : fixed `haxe.CallStack.exceptionStack` (#9968)
+
 2020-09-11 4.1.4:
 
 	General improvements:
@@ -18,7 +37,7 @@
 	flash : fixed loading swc libraries containing `Vector` without a type parameter (#9805)
 	hl : fixed messages being send to wrong threads with `sendMessage`/`readMessage` in `sys.thread.Thread` (#9875)
 	cpp : fixed `cpp.Lib.stringReference()` (#8457)
-	
+
 2020-07-22 4.1.3
 
 	General improvements: