Update .gitattributes

Dependencies

• [2] 7SAFZCBX Update .gitattributes
• [3] J4ZLIYPB Override linguist mis-detection.

Change contents

• replacement in .gitattributes at line 1
  [3.17]→[2.0:39](∅→∅)
  − 2017/day5*.bas linguist-language=BASIC
  [3.17]
  + 2017/day5*.bas linguist-language=BASIC linguist-detectable=true