v0.4.1

PNGFiles v0.4.1

Diff since v0.4.0

Merged pull requests:

• enable dependabot for GitHub actions (#62) (@ranocha)
• Bump actions/checkout from 2 to 3 (#67) (@dependabot[bot])
• Bump actions/checkout from 3 to 4 (#68) (@dependabot[bot])
• fix memory corruption when reading palette (#69) (@vtjnash)