CHANGELOG: Format Markdown (#195)
CHANGELOG: Format Markdown (#195)

* CHANGELOG: Format Markdown

- Fix typos
- Link to PRs
- Use reference-style links to repeating links

* CHANGELOG: Avoid typo
jcsjcs/pg_query,jcsjcs/pg_query,lfittl/pg_query,jcsjcs/pg_query,lfittl/pg_query