Add PlatformEncoding and Utf8PlatformEncoding (#34) #135

Job	Run time
Run examples using Rust stable (ubuntu-latest)	19s
Verify code formatting (windows-latest)	36s
Lint with clippy (windows-latest, --all-features)	1m 20s
Test Rust stable (windows-latest, x86_64-pc-windows-msvc --all-features)	1m 44s
Verify code formatting (ubuntu-latest)	8s
Lint with clippy (windows-latest, --no-default-features)	28s
Test Rust stable (windows-latest, x86_64-pc-windows-msvc --no-default-features)	1m 56s
Lint with clippy (ubuntu-latest, --all-features)	7s
Test Rust stable (macos-latest, --all-features)	25s
Lint with clippy (ubuntu-latest, --no-default-features)	25s
Test Rust stable (macos-latest, --no-default-features)	34s
Test Rust stable (ubuntu-latest, --all-features)	42s
Test Rust stable (ubuntu-latest, --no-default-features)	24s
Test Rust stable (ubuntu-latest, wasm32-unknown-unknown --all-features)	6s
Test Rust stable (ubuntu-latest, wasm32-unknown-unknown --no-default-features)	8s
Test Rust 1.58.1 (ubuntu-latest, --all-features)	50s
Test Rust 1.58.1 (ubuntu-latest, --no-default-features)	43s
	10m 55s

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