Bump MSRV to 1.56

GPHemsley · emilio · commit 63e209c815d8 · 2022-12-12T17:19:17.000+01:00
Closes #315
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
@@ -16,7 +16,7 @@ jobs:
           - nightly
           - beta
           - stable
-          - 1.40.0
+          - 1.56.0
         features:
           -
           - --features dummy_match_byte
diff --git a/Cargo.toml b/Cargo.toml
@@ -11,6 +11,7 @@ keywords = ["css", "syntax", "parser"]
 license = "MPL-2.0"
 build = "build.rs"
 edition = "2018"
+rust-version = "1.56"
 
 exclude = ["src/css-parsing-tests/**", "src/big-data-url.css"]
 
