Changed block code tags

example_templates/code_block.n0m

@@ -1,5 +1 @@
-<h1>Hello</h1>
+ <{ echo "hi" }>
-${
-  echo "hello world";
-  echo "\}$";
-}$

src/token_stream.mjs

@@ -3,8 +3,8 @@ import { TemplateSyntaxError } from './errors/template_syntax_error.mjs';
 
 export class TokenStream {
   static ESCAPE = '\\';
-  static OPEN_STATEMENT = '${';
+  static OPEN_STATEMENT = '<{';
-  static CLOSE_STATEMENT = '}$';
+  static CLOSE_STATEMENT = '}>';
   static OPEN_INLINE = '<%';
   static CLOSE_INLINE = '%>';
   static OPEN_INLINE_UNESCAPED = '<!%';