[m-rev.] for review: add a NEWS section for 22.01.6

[Julien Fischer]

For review by anyone.

----------------------

Add a NEWS section for 22.01.6.

NEWS.md:
     As above.

Julien.

diff --git a/NEWS.md b/NEWS.md
index b11d535..20f1b81 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -162,8 +162,8 @@ Changes to the Mercury standard library
      - func `transitive_closure/1`           (synonym for `tc/1`)
      - func `reflexive_transitive_closure/1` (synonym for `rtc/1`)

-* We have fixed and improved the implementations of transitive closure and
-  reflexive transitive closure.
+* We have improved the implementations of transitive closure and reflexive
+  transitive closure.

  ### Changes to the `enum` module

@@ -1097,6 +1097,18 @@ Changes to the extras distribution

  * We have deleted the `old_term_parser` library.

+NEWS for Mercury 22.01.6
+========================
+
+This is a bug-fix release.
+
+* We have fixed the implementations of transitive closure and reflexive
+  transitive closure in the `digraph` module.
+
+* We have a fixed a bug in `string.format` and related predicates where `int8`,
+  `int16` and `int32` values were being incorrectly promoted to `int` and sign
+  extended when one of the unsigned conversion specifiers was applied.
+
  NEWS for Mercury 22.01.5
  ========================