feat: support TOML 1.1

Assisted-by: GLM 5.3 Flash

README.md

@@ -1,17 +1,18 @@
 # interpres
 
-A TOML 1.0 parser and encoder for Go, written with the standard library alone.
-`interpres` (Latin for *interpreter*) gives zero-dependency programs an
-`encoding/json`-style API for reading and writing TOML, and passes the entire
-official [toml-test](https://github.com/toml-lang/toml-test) suite: 205 valid
-and 474 invalid cases, zero failures.
+A TOML 1.0 and 1.1 parser and encoder for Go, written with the standard
+library alone. `interpres` (Latin for *interpreter*) gives zero-dependency
+programs an `encoding/json`-style API for reading and writing TOML, and passes
+the entire official [toml-test](https://github.com/toml-lang/toml-test) suite:
+214 valid and 467 invalid cases, zero failures.
 
 ## Features
 
-- **Full TOML 1.0**: bare, quoted and dotted keys; tables and arrays of tables;
-  basic and literal strings including multiline; integers in the four radixes
-  with `_` separators; floats with exponents, `inf` and `nan`; booleans; the
-  four date-time kinds; arrays and inline tables.
+- **Full TOML 1.0 and 1.1**: bare, quoted and dotted keys; tables and arrays of
+  tables; basic and literal strings including multiline, with the 1.1 `\e` and
+  `\xHH` escapes; integers in the four radixes with `_` separators; floats with
+  exponents, `inf` and `nan`; booleans; the four date-time kinds, seconds
+  optional as of 1.1; arrays and inline tables, multi-line as of 1.1.
 - **Decoding and encoding**: `Parse` for an untyped tree, `Unmarshal` and
   `Marshal` for structs and maps, mirroring `encoding/json`.
 - **Strict decoding**: `NewDecoder().DisallowUnknownFields()` rejects keys that