Update README.md

Example was wrong.

README.md

@@ -72,34 +72,26 @@ Visit [http://localhost:8080/](http://localhost:8080/), and paste this into the
 
 # Simple fixes
 
-add_field(hello,"world")
-remove_field(my.deep.nested.junk)
-copy_field(stats,output.$append)
+add_field("hello","world")
+remove_field("my.deep.nested.junk")
+copy_field("stats","output.$append")
 
 # Conditionals
 
-if exists(error)
-    set_field(is_valid, no)
-    log(error)
-elsif exists(warning)
-    set_field(is_valid, yes)
-    log(warning)
+if exists("error")
+    set_field("is_valid", "no")
+    log("error")
+elsif exists("warning")
+    set_field("is_valid", "yes")
+    log("warning")
 else
-    set_field(is_valid, yes)
+    set_field("is_valid", "yes")
 end
 
 # Loops
 
-do list(path)
-    add_field(foo,bar)
-end
-
-# Nested expressions
-
-do marc_each()
-    if marc_has(f700)
-        marc_map(f700a,authors.$append)
-    end
+do list(path: "foo", "var":"$i")
+    add_field("$i","bar")
 end
 ```