Missing alias for writeBigUint64BE / LE

[ViktorWb]

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Node exposes aliases for the writeBigUInt64BE and writeBigUInt64LE functions as writeBigUint64BE and writeBigUint64LE respectively (the difference is the capitalization of the i).

See the Node documentation here.

The other write functions, such as writeUInt32BE, have their aliases properly implemented in this library, but the bigint ones seem to be missing.

[Le0X8]

Is this an issue with the types? Then I fixed it within this pull request: #360

Edit: It isn't. The alias is literally missing here and here.

[Le0X8]

Duplicate: #318