v0.25.0

• Improve 3 error messages when working with libraries and overlays

84a5aa9a9d5c3b67f21136542ecb73aa2c809298094fea21edffb4d2a0cb2f0d  ./ytt-darwin-amd64
2ccd2c74fea87748515ed3fd74cd45c31f91472fabadf42e6a958f52312e3b47  ./ytt-linux-amd64
e8d6cadb6b875adff3cc3bd33c5da82323466999511dcac28a04e1c895d05c8e  ./ytt-windows-amd64.exe

(Installation instructions: https://k14s.io/#install-from-github-release)