fail when go is < 1.12

Author: Shlomi Noach

build.sh

@@ -18,11 +18,9 @@ function build {
   GOOS=$3
   GOARCH=$4
 
-
-
   if ! go version | egrep -q 'go(1\.1[234])' ; then
     echo "go version must be 1.12 or above"
-    ok=1
+    exit 1
   fi
 
   echo "Building ${osname} binary"