run doesn't run things properly

[withinboredom]

Do you want to request a feature or report a bug?
bug

What is the current behavior?

yarn run build
$ "./go.sh build"
sh: ./go.sh build: No such file or directory
error Command failed with exit code 127.
info Visit http://yarnpkg.com/en/docs/cli/run for documentation about this command.

If the current behavior is a bug, please provide the steps to reproduce.
Create a package.json with the following:

{
  "scripts": {
    "build" : "./go.sh build"
}

and a file called go.sh in the same directory:

echo "hello world"
echo "You typed: $@"

What is the expected behavior?
Output to be similar to:

hello world
you typed: build

Please mention your node.js, yarn and operating system version.
yarn: 0.15.1

This works fine in 0.15.0

[icd2k3]

This should be fixed in #809

[sebmck]

Yup, fixed in #809.