Don't use headings to format titles in CHANGELOG.
CompilerGym v0.2.5 adds a new LLVM dataset, two new observation spaces, and
includes numerous updates and bug fixes.
-## Summary of Changes
+**Summary of Changes**
- [llvm] Added two new observation spaces, `LexedIr` and `LexedIrTuple`,
providing access to a sequence of IR tokens
@@ -46,7 +46,7 @@ includes numerous updates and bug fixes.
- Reduced verbosity and wall time of CMake builds.
- Updates and fixes dependent package conflicts (fixes #771, #768).
-## Credits
+**Credits**
A huge thank you to all code contributors!
