changelog: rename parameters to reflect semantics
`read` and `readfiles` can be used with a revision just as well, so
follow the naming convention in revlog to reflect this.
Differential Revision: https://phab.mercurial-scm.org/D10081
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2