Doc: Make changelog sphinx-friendly
+Next
+---------------------
+
0.6.0 (2020-03-15)
--------
+---------------------
- Correctly set .so version [[Fixes #52]](https://github.com/PJK/libcbor/issues/52).
- **Warning**: All previous releases will be identified as 0.0 by the linker.
- Fix & prevent heap overflow error in example code [[#74]](https://github.com/PJK/libcbor/pull/74) [[#76]](https://github.com/PJK/libcbor/pull/76) (by @nevun)
- [Fix misplaced 0xFF bytes in maps possibly causing memory corruption](https://github.com/PJK/libcbor/pull/82)
- BREAKING: Fix handling & cleanup of failed memory allocation in constructor
and builder helper functions [[Fixes #84]](https://github.com/PJK/libcbor/issues/84)
- - All cbor_new_ and cbor_build_ functions will now explicitly return NULL
- when memory allocation fails
+ - All cbor_new_* and cbor_build_* functions will now explicitly return NULL when memory allocation fails
- It is up to the client to handle such cases
- Globally enforced code style [[Fixes #83]](https://github.com/PJK/libcbor/issues/83)
- Fix issue possible memory corruption bug on repeated
