extend 1.2.0

Create extensions for types you don't own with extension traits but without the boilerplate.
Documentation 
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name: CI

on:
  push:
    branches:
    - master
  pull_request: {}

jobs:
  check:
    # Run `cargo check` first to ensure that the pushed code at least compiles.
    runs-on: ubuntu-latest
    strategy:
      matrix:
        rust: [stable, 1.40.0]
    steps:
    - uses: actions/checkout@master
    - uses: actions-rs/toolchain@v1
      with:
        toolchain: ${{ matrix.rust }}
        profile: minimal
    - name: Check
      uses: actions-rs/cargo@v1
      with:
        command: clippy
        args: --all --all-targets --all-features
    - name: rustfmt
      uses: actions-rs/cargo@v1
      with:
        command: fmt
        args: --all -- --check

  cargo-hack:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@master
    - uses: actions-rs/toolchain@v1
      with:
        toolchain: stable
        profile: minimal
    - name: Install cargo-hack
      run: |
        curl -LsSf https://github.com/taiki-e/cargo-hack/releases/latest/download/cargo-hack-x86_64-unknown-linux-gnu.tar.gz | tar xzf - -C ~/.cargo/bin
    - name: cargo hack check
      working-directory: ${{ matrix.subcrate }}
      run: cargo hack check --each-feature --no-dev-deps --all

  test-versions:
    # Test against the stable, beta, and nightly Rust toolchains on ubuntu-latest.
    needs: check
    runs-on: ubuntu-latest
    strategy:
      matrix:
        rust: [stable, beta, nightly, 1.40.0]
    steps:
    - uses: actions/checkout@master
    - uses: actions-rs/toolchain@v1
      with:
        toolchain: ${{ matrix.rust }}
        profile: minimal
    - name: Run tests
      uses: actions-rs/cargo@v1
      with:
        command: test
        args: --all --all-features

  deny-check:
    name: cargo-deny check
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1
    - uses: EmbarkStudios/cargo-deny-action@v1