Update paths for staticcheck and gosimple

[sridharv]

The paths have been changed:

From https://groups.google.com/forum/#!topic/golang-nuts/fQQiO4OPdmQ

I have consolidated all of my Go tools in one place at
honnef.co/go/tools (backed by github.com/dominikh/go-tools)

This has changed a number of import paths. The command lines for
the tools now live at honnef.co/go/tools/cmd – for example,
staticcheck has moved from
honnef.co/go/staticcheck/cmd/staticcheck to
honnef.co/go/tools/cmd/staticcheck. Similarly, the supporting
libraries have moved to honnef.co/go/tools as well.

In order to make the transition as pain-free as possible, the old
import paths and GitHub repositories will keep working for a
limited time. Concretely, the following deprecation schedule is in
place:

1. Beginning now, the authoritative place for all code, issues
and pull requests is at github.com/dominikh/go-tools. The old
repositories will not receive new features or bug fixes. The old
import paths will – out of necessity – keep pointing to the old
repositories.

2. Starting March 1st, tools installed from the old locations
will unconditionally exit with a non-zero status code and emit a
deprecation warning. They will otherwise keep functioning like
normal.

3. Starting April 1st, all code in the old locations will be
removed and replaced with a single file causing a build failure,
instructing users to use the new location.

I am sorry for the inconvenience this causes. However, developing
all tools in a single repository will have benefits in the long
run and is worth the disruption.

Cheers,
Dominik