DotenvPopulateOutput typing is incorrect

[richard-paragon]

The populate function has no return statement, so it cannot return an object of the form that DotenvPopulateOutput describes.

For reference:

export interface DotenvPopulateOutput {
  error?: Error;
}

/**
 * [...]
 * @returns {void}
 */
export function populate(/* ... */): DotenvPopulateOutput;

Should be:

export function populate(/* ... */): void;

[motdotla]

will go into next release