debian/changelog: new upstream release entry added

Gbp-Dch: Ignore

debian/changelog

+openexr (2.5.4-1) UNRELEASED; urgency=medium
+
+  * New upstream release
+  * debian/watch: parameters updated
+  * debian/control: S-V bump 4.5.0 -> 4.5.1 (no changes needed)
+
+ -- Matteo F. Vescovi <mfv@debian.org>  Thu, 21 Jan 2021 23:18:40 +0100
+
 openexr (2.5.3-2) unstable; urgency=medium
 
   * Upload to unstable (Closes: #959444)