update changelog for release 0.5.13
To generate the log, run `git log --pretty='* %h - %s (%an, %ad)' TAGNAME..HEAD .` replacing TAGNAME and HEAD as appropriate.
+# 0.5.13 - matching of binary payloads
+
+* 708db47 - feat: implement matching of binary payloads (application/octet-stream) (Ronald Holshausen, Fri May 8 15:52:03 2020 +1000)
+* 754a483 - chore: updated itertools to latest (Ronald Holshausen, Wed May 6 15:49:27 2020 +1000)
+* b6b81a3 - bump version to 0.5.13 (Ronald Holshausen, Tue May 5 16:39:23 2020 +1000)
+
# 0.5.12 - Bugfix Release
* d85f28c - fix: mock server matching requests with headers with multiple values (Ronald Holshausen, Tue May 5 15:23:11 2020 +1000)
