[vala: 4/4] Sync NEWS from 0.48

[Rico Tzschichholz <ricotz src gnome org>]

commit a3e7970cea5071a45228b4e3c4209f9b5efdecdb
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue May 19 15:34:56 2020 +0200

    Sync NEWS from 0.48

 NEWS | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
---
diff --git a/NEWS b/NEWS
index 784a44449..468277188 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,25 @@
+Vala 0.48.6
+===========
+ * Regression and bug fixes:
+  - codegen:
+    + Correctly handle cast-expression of real struct to nullable struct [#991]
+    + Use loop index instead of get_ccode_pos() for ellipsis parameter [#995]
+  - vala:
+    + Allow node_ref being null in SemanticAnalyzer.get_instance_base_type()
+    + SemanticAnalyzer.get_instance_base_type() is not allowed to return null
+    + params-array parameter is not allowed in abstract/virtual method [#985]
+    + Use stable hash for methods in HashMap of implicit_implementations [#990]
+      and Use "str_equal" as equal_func for ArrayList<string> instances
+    + Set value_type of undefined member-access to avoid further criticals
+    + Transform cast from floating-type to boxed-type [#991]
+    + Transform cast from integer-type to boxed-type [#992]
+    + Explicit "new" method may be incompatible with a posssible base method
+  - valadoc: Add implicit "Posix" using-directive for POSIX profile
+  - girparser: Add support for boolean "new" argument for methods
+
+ * Bindings:
+  - gtk4: Update to 3.98.3+028942c8
+
 Vala 0.48.5
 ===========
  * Regression and bug fixes: