test: fix lint error

Not sure why this wasn't raised when I was running the release,
the tests definitely passed.  Fixed now, at any rate.

Author: isaacs

test/tap/bin-overwriting.js

@@ -8,10 +8,11 @@ const path = require('path')
 const readBinCb = process.platform === 'win32' ? readCmdShim : readlink
 const readBin = bin => new Promise((resolve, reject) => {
   readBinCb(bin, (er, target) => {
-    if (er)
+    if (er) {
       reject(er)
-    else
+    } else {
       resolve(path.resolve(pkg + '/global/bin', target))
+    }
   })
 })