Add string match for prints

grammars/mblf.cson

@@ -30,6 +30,11 @@ patterns: [
     captures:
       4: name: 'builtin.variable'
   },
+  {
+    match: '(^\\s*)(prints)\ +(\"[[:ascii:]]*\")'
+    captures:
+      3: name: 'string'
+  },
   {
     match: ';;.*$'
     name: 'comment'