Update release script

Author: mjackson

scripts/release.sh

@@ -2,7 +2,7 @@
 
 changelog=node_modules/.bin/changelog
 
-if ! [ -e scripts/build.js ]; then
+if ! [ -e scripts/release.sh ]; then
   echo >&2 "Please run scripts/release.sh from the repo root"
   exit 1
 fi