readme: Add missing requirements

Synchronize dependencies with pyproject.toml
I am not fan of maintaining two lists
Done for the sake of completion

README.md

@@ -34,12 +34,14 @@ It is currently used by following programs:
 ## Requirements
 
 - Python >= 3.8.0
+- [graphql-core](https://pypi.org/project/graphql-core)
 - [websocket-client](https://pypi.org/project/websocket-client)
 - [jsonschema](https://pypi.org/project/jsonschema)
 - [pyPEG2](https://pypi.org/project/pyPEG2)
 - [base58](https://pypi.org/project/base58)
 - [libnacl](https://pypi.org/project/libnacl)
 - [pyaes](https://pypi.org/project/pyaes)
+- [mnemonic](https://pypi.org/project/mnemonic)
 
 ## Installation