bump utf8proc to v1.3

[stevengj]

This gives us support for Unicode 8.

(Compared to Julia 0.3, this means we are jumping 3 Unicode versions.)

[stevengj]

If there are no objections, I'll go ahead and merge this later today or tomorrow.

cc: @nalimilan, @jiahao

[nalimilan]

Yes, that's fine with me.

[jiahao]

Should be fine.

[tkelman]

This is missing checksums for NO_GIT builds, I'll add them

[stevengj]

Where do those go?

[tkelman]

deps/checksums - they're autogenerated if you do make NO_GIT=1 -C deps get-utf8proc, anyone else who builds with NO_GIT (including travis and appveyor) will get a warning if the checksum files aren't committed, though that warning's pretty easy to miss