Add changelog entry for trailing-slash fix (#1137)

https://claude.ai/code/session_01HousmFCGC1BbEczgkmTSC6

Author: claude

CHANGELOG.rst

@@ -12,6 +12,7 @@ Release 0.14.0 (unreleased)
 * Edit manifest in-place when freezing inside a git or SVN superproject, preserving comments and layout (#1063)
 * Add new ``remove`` command to remove projects from manifest and disk (#26)
 * Fix "unsafe symlink target" error for archives containing relative ``..`` symlinks (#1122)
+* Fix ``dfetch add`` crashing with a ``ValueError`` when the remote URL has a trailing slash (#1137)
 
 Release 0.13.0 (released 2026-03-30)
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