docs(msrv): declare rust-version = 1.88 (#208)

0.3.15's streaming reader uses a let-chain (stabilized in Rust 1.88); declare the MSRV so cargo emits a clean version error for 1.85-1.87 consumers. CHANGELOG noted. No code change.

Author: dginev

CHANGELOG.md

@@ -31,6 +31,9 @@
 
 ### Changed
 
+* **Minimum supported Rust version is now 1.88** (declared via `rust-version`).
+  The streaming `reader` uses a let-chain (stabilized in 1.88); the edition is
+  already 2024. Consumers on 1.85–1.87 that built 0.3.14 will need to update.
 * `Node::_wrap`'s per-document `xmlNodePtr -> Node` cache now hashes pointer keys
   with a small FxHash-style hasher instead of the default SipHash `RandomState`.
   The cache is probed on every `Node` wrap (child/sibling walks, XPath results,

Cargo.toml

@@ -2,6 +2,7 @@
 name = "libxml"
 version = "0.3.15"
 edition = "2024"
+rust-version = "1.88"
 authors = ["Andreas Franzén <andreas@devil.se>", "Deyan Ginev <deyan.ginev@gmail.com>","Jan Frederik Schaefer <j.schaefer@jacobs-university.de>"]
 description = "A Rust wrapper for libxml2 - the XML C parser and toolkit developed for the Gnome project"
 repository = "https://github.com/KWARC/rust-libxml"