Merge pull request #42 from vladdoster/patch-1

This will help macOS install not fail

utils/install.sh

@@ -4,7 +4,9 @@ set -o nounset    # error when referencing undefined variable
 set -o errexit    # exit when command fails
 
 installnodemac() { \
+  brew install lua
   brew install node
+  brew install yarn
 }
 
 installnodeubuntu() { \