Raise minimum tested compiler to rust 1.60

Required by newest version of num-traits.

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: [nightly, beta, stable, 1.35.0]
+        rust: [nightly, beta, stable, 1.52.0]
     timeout-minutes: 45
     steps:
       - uses: actions/checkout@v4
@@ -36,17 +36,6 @@ jobs:
         if: matrix.rust == 'nightly'
       - run: cargo test
 
-  msrv:
-    name: Rust 1.31.0
-    needs: pre_ci
-    if: needs.pre_ci.outputs.continue
-    runs-on: ubuntu-latest
-    timeout-minutes: 45
-    steps:
-      - uses: actions/checkout@v4
-      - uses: dtolnay/[email protected]
-      - run: cargo check
-
   minimal:
     name: Minimal versions
     needs: pre_ci

Cargo.toml

@@ -9,7 +9,7 @@ edition = "2018"
 keywords = ["float"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/dtolnay/precise"
-rust-version = "1.31"
+rust-version = "1.52"
 
 [dependencies]
 num-bigint = "0.4.2"