Cowboy 2.12, Cowlib 2.13, Gun 2.1

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+[appendix]
+== Migrating from Gun 1.0 to 1.1
+
+Gun 1.1 updates the Cowlib dependency to 2.5.1 and fixes a
+few problems with experimental features.
+
+=== Features added
+
+* Update Cowlib to 2.5.1
+
+=== Bugs fixed
+
+* A bug in the experimental `gun_sse_h` where lone id lines
+  were not propagated has been fixed by updating the Cowlib
+  dependency.
+
+* The status code was incorrectly given to the experimental
+  content handlers as a binary. It has been fixed an an
+  integer is now given as was intended.
+
+* A number of Dialyzer warnings have been fixed.