raise toolchain and msrv

Author: xacrimon

.github/workflows/ci.yml

@@ -7,11 +7,6 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
     - uses: actions/checkout@v2
-    - name: setup
-      run: |
-        rustup install stable-2020-06-18-x86_64-unknown-linux-gnu
-        rustup component add rustfmt --toolchain stable-2020-06-18-x86_64-unknown-linux-gnu
-        rustup component add clippy --toolchain stable-2020-06-18-x86_64-unknown-linux-gnu
     - name: style
       run: cargo fmt -- --check
     - name: clippy

README.md

@@ -20,7 +20,7 @@ If you have any suggestions or tips do not hesitate to open an issue or a PR.
 
 [![downloads](https://img.shields.io/crates/d/dashmap)](https://crates.io/crates/dashmap)
 
-[![minimum rustc version](https://img.shields.io/badge/rustc-1.44.1-orange.svg)](https://crates.io/crates/dashmap)
+[![minimum rustc version](https://img.shields.io/badge/rustc-1.49-orange.svg)](https://crates.io/crates/dashmap)
 
 ## Cargo features
 

rust-toolchain

@@ -1 +1,4 @@
-stable-2020-06-18
+[toolchain]
+channel = "stable-2020-12-31"
+components = [ "rustfmt", "clippy" ]
+profile = "minimal"