Remove rust format from the CI

Author: 38

.github/workflows/plotters-core.yml

@@ -3,21 +3,6 @@ name: Plotters Core Crate
 on: [push, pull_request]
 
 jobs:
-  fmt:
-    name: rustfmt
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-      - run: rustup component add rustfmt
-      - uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: --all -- --check
   doc:
     name: cargo-doc
     runs-on: ubuntu-latest