fix unicode issue.#4

ELBEQQAL94 wants to merge 2 commits intobhancockio:mainbhancockio/langchain-crash-course:mainfrom

ELBEQQAL94:bugfix/text-loader-UnicodeDecodeErrorELBEQQAL94/langchain-crash-course:bugfix/text-loader-UnicodeDecodeErrorCopy head branch name to clipboard