Update changelog for 2.13.0-1 release

debian/changelog

+fortran-language-server (2.13.0-1) unstable; urgency=medium
+
+  * update d/watch according to uscan man page
+  * switch upstream repository to gnikit/fortls
+  * New upstream version 2.13.0
+  * update debian packaging files and patches
+  * update Standards-Version to 4.6.1 (no changes needed)
+
+ -- Denis Danilov <danilovdenis@yandex.ru>  Sun, 16 Oct 2022 10:10:27 +0200
+
 fortran-language-server (1.12.0-1) unstable; urgency=medium
 
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