Move outer_product back in the changelog

Author: awvwgk

CHANGELOG.md

@@ -27,6 +27,8 @@ Full release notes available at [v0.1.0] tag.
 - new module `stdlib_linalg`
   - new procedures `diag`, `eye` and `trace`
     [#170](https://github.com/fortran-lang/stdlib/pull/170)
+  - new procedure `outer_product`
+    [#432](https://github.com/fortran-lang/stdlib/pull/432)
 - new module `stdlib_logger`
   - new derived type: `logger_type`
     [#228](https://github.com/fortran-lang/stdlib/pull/228)
@@ -36,8 +38,6 @@ Full release notes available at [v0.1.0] tag.
     [#355](https://github.com/fortran-lang/stdlib/pull/355)
   - new procedures `linspace` and `logspace`
     [#420](https://github.com/fortran-lang/stdlib/pull/420)
-  - new procedure `outer_product`
-    [#432](https://github.com/fortran-lang/stdlib/pull/432)
   - new procedure `arange`
     [#480](https://github.com/fortran-lang/stdlib/pull/480)
 - new module `stdlib_optval`