bump MSRV to 1.55

Author: jordens

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
 
         include:
           # Test MSRV
-          - rust: 1.51.0
+          - rust: 1.55.0  # keep in sync with manifest rust-version
             TARGET: x86_64-unknown-linux-gnu
 
           # Test nightly but don't fail

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
   `NEG_INFINITY`) to result in JSON `null`. This matches `serde_json` behavior.
 - Changed deserialization of JSON `null` where `f32`/`f64` is expected to result in
   the respective `NAN`.
+- [breaking-change] increase MSRV to Rust `1.55.0` due to `maybe_uninit_extra`.
 
 ## [v0.4.0] - 2021-05-08
 

Cargo.toml

@@ -4,6 +4,7 @@ categories = ["no-std"]
 description = "serde-json for no_std programs"
 documentation = "https://docs.rs/serde-json-core"
 edition = "2018"
+rust-version = "1.55.0"  # keep in sync with ci
 keywords = ["serde", "json"]
 license = "MIT OR Apache-2.0"
 name = "serde-json-core"