Use correct filename case for keywords.txt

Use of filename case other than exactly keywords.txt causes the file to not be recognized by the Arduino IDE on a filename case-sensitive OS such as Linux.

Reference:
https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#keywords
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per1234 2019-05-07 21:35:37 -07:00 committed by GitHub
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