add CHANGELOG.md

Author: fbdtemme

CHANGELOG.md

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+# Changelog
+
+## v0.1.1
+
+*   Fix invalid output of `events::debug_to` for lists and dicts.
+*   Replace macro `BENCODE_SERIALIZES_TO_DICT` by `BENCODE_SERIALIZES_TO_DICT_SORTED`
+    and `BENCODE SERIALIZED_TO_DICT_UNSORTED`. `serializes_to_dict` 
+    now takes an enum non-type template argument `dict_key_order` 
+    to indicate if the dict default iteration order is sorted or not.
+*   Fix various event producing compilation errors.
+
+## v0.1.0
+
+Initial release.