doc/go1.5.txt: go generate -run

Change-Id: I8029640fe74731d7847390f371af37b85dec96cc
Reviewed-on: https://go-review.googlesource.com/9006Reviewed-by: Rob Pike <r@golang.org>

doc/go1.5.txt

@@ -61,6 +61,7 @@ cmd/go, go/build: add ${SRCDIR} variable expansion to cgo lines (https://golang.
 cmd/go: add $DOLLAR to generate's variables (https://golang.org/cl/8091)
 cmd/go: std wildcard now excludes commands in main repo (https://golang.org/cl/5550)
 cmd/go: .swig/.swigcxx files now require SWIG 3.0.6 or later
+cmd/go: add -run flag to go generate (https://golang.org/cl/9005)
 cmd/vet: better validation of struct tags (https://golang.org/cl/2685)
 cmd/ld: no longer record build timestamp in Windows PE file header (https://golang.org/cl/3740)
 cmd/go: add -toolexec build option