doc: dummy commit in go1.5.txt

Change-Id: I678336daf99f7d7d19f99506f1a604de8e05bf43
Reviewed-on: https://go-review.googlesource.com/5400Reviewed-by: Russ Cox <rsc@golang.org>

doc/go1.5.txt

@@ -33,3 +33,4 @@ sort: number of Sort performance optimizations (https://golang.org/cl/2100, http
 strconv: optimize decimal to string conversion (https://golang.org/cl/2105)
 math/big: faster assembly kernels for amd64 and 386 (https://golang.org/cl/2503, https://golang.org/cl/2560)
 math/big: faster "pure Go" kernels for platforms w/o assembly kernels (https://golang.org/cl/2480)
+