fix row.assign to use Partial<T>

Author: theoephraim

src/lib/GoogleSpreadsheetRow.ts

@@ -50,9 +50,9 @@ export class GoogleSpreadsheetRow<T extends Record<string, any> = Record<string,
  this._rawData[index] = val;
  }
  /** set multiple values in the row at once from an object */
- assign(obj: T) {
+ assign(obj: Partial<T>) {
  // eslint-disable-next-line no-restricted-syntax, guard-for-in
- for (const key in obj) this.set(key, obj[key]);
+ for (const key in obj) this.set(key, obj[key] as any);
  }
 
  /** return raw object of row data */