fix: Revert "feat: bump minimum node version to 16 and add tests (#86)"

This reverts commit 8e2842b4a3.

test/sha.spec.ts

@@ -1,11 +0,0 @@
-import * as path from 'path';
-
-import { sha } from '../src/sha';
-
-describe('sha', () => {
-  it('should correctly hash a file', async () => {
-    expect(await sha(path.resolve(__dirname, 'fixtures', 'tohash'))).toEqual(
-      '12998c017066eb0d2a70b94e6ed3192985855ce390f321bbdb832022888bd251',
-    );
-  });
-});