Fix `raise NotImplemented` on import #79

Job	Run time
buildMacOs39 (x86_64, macos-latest, 3.9, https://github.com/disintar/ton/releases/download/ton-cp...	42s
buildMacOs39 (aarch64, macOS, 3.9, https://github.com/disintar/ton/releases/download/ton-cpython-...	8s
build (x86_64, macos-latest, 3.10, https://github.com/disintar/ton/releases/download/ton-cpython-...	21s
build (x86_64, macos-latest, 3.11, https://github.com/disintar/ton/releases/download/ton-cpython-...	25s
build (x86_64, Linux, 3.9, https://github.com/disintar/ton/releases/download/ton-cpython-39-x86_6...	11s
build (x86_64, Linux, 3.10, https://github.com/disintar/ton/releases/download/ton-cpython-310-x86...	12s
build (x86_64, Linux, 3.11, https://github.com/disintar/ton/releases/download/ton-cpython-311-x86...	1s
build (aarch64, macOS, 3.10, https://github.com/disintar/ton/releases/download/ton-cpython-310-aa...	8s
build (aarch64, macOS, 3.11, https://github.com/disintar/ton/releases/download/ton-cpython-311-aa...	2s
build (x86_64, windows-2019, 3.9, https://github.com/disintar/ton/releases/download/ton-cpython-3...	13s
build (x86_64, windows-2019, 3.10, https://github.com/disintar/ton/releases/download/ton-cpython-...	14s
build (x86_64, windows-2019, 3.11, https://github.com/disintar/ton/releases/download/ton-cpython-...	16s
buildVirtualLinux	0s
Publish 🐍📦 to PyPI	0s
	2m 53s

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