v1.3.1

• 20226c2 Update version to v1.3.1
• 3af8ac4 Fix encode in setHeader() with skipEncoding option
• 9d9bd6c Fix typo
• 1a50f1d Add pipeline for spell checking
• 54c7c0d Move tests.yml to ci.yml
• 2c45351 Add test cases for check encoding / decoding