Update changelog

debian/changelog

@@ -1,8 +1,21 @@
 obs-studio (21.0.2+dfsg1-1) UNRELEASED; urgency=medium
 
+  [ Sebastian Ramacher ]
   * New upstream release.
+    - Fix building with ffmpeg 3.5. (Closes: #888361)
+  * debian/patches:
+    - Refresh patches.
+    - Do not display license on first startup. (Closes: #867756)
+  * debian/control:
+    - Bump Standards-Version
+  * debian/: Bump debhelper compat to 11.
+  * debian/libobs0.symbols: Update symbols.
 
- -- Sebastian Ramacher <sramacher@debian.org>  Mon, 19 Feb 2018 20:58:53 +0100
+  [ Ondřej Nový ]
+  * d/control: Set Vcs-* to salsa.debian.org.
+  * d/copyright: Use https protocol in Format field.
+
+ -- Sebastian Ramacher <sramacher@debian.org>  Mon, 19 Feb 2018 21:34:51 +0100
 
 obs-studio (19.0.3+dfsg1-1) unstable; urgency=medium