fixed off-by-one in parser

tests/fuzzer/readme.md

@@ -11,6 +11,7 @@ For details about **libFuzzer** see: https://llvm.org/docs/LibFuzzer.html
 To build and run these tests LLVM compiler (with clang frontend) and CMake should be installed before.
 
 The fuzzer section include four tests:
+- `annotator_fuzzer` checks that inputs given to the flatc --annotate are always parsable;
 - `verifier_fuzzer` checks stability of deserialization engine for `Monster` schema;
 - `parser_fuzzer` checks stability of schema and json parser under various inputs;
 - `scalar_parser` focused on validation of the parser while parse numeric scalars in schema and/or json files;