docs(changelog): include changelog for release 3.1.2

Merged from the 3.1.x branch.

Author: darrachequesne

CHANGELOG.md

@@ -1,3 +1,13 @@
+## [3.1.2](https://github.com/socketio/socket.io-emitter/compare/3.1.1...3.1.2) (2020-12-29)
+
+
+### Bug Fixes
+
+* **binary:** fix binary events being marked as regular events ([#76](https://github.com/socketio/socket.io-emitter/issues/76)) ([52483f9](https://github.com/socketio/socket.io-emitter/commit/52483f976982f45dc7335280a3ab4a8bf4a80aa9))
+* handle missing namespace prefix ([03efd37](https://github.com/socketio/socket.io-emitter/commit/03efd372a0d584c3f44d4bcefd0ba475dd042fa8))
+
+
+
 # [3.2.0](https://github.com/socketio/socket.io-emitter/compare/3.1.1...3.2.0) (2020-12-29)