unicode/rangetable: Add key name when initializng Range16 and Range32.

GAE explicitly rejects unkeyed struct initialization. See similar discussion for net/mail:
https://groups.google.com/forum/#!topic/golang-nuts/2ShgtUHsdqY

Change-Id: I9ce1913fc4fc76e4b10b0a11dc49c03e5d1039b0
Reviewed-on: https://go-review.googlesource.com/12020
Reviewed-by: Nigel Tao <nigeltao@golang.org>
1 file changed