Merge pull request #406 from marioevz/patch-5

Add Felix Hoffmann

Author: cheeky-gorilla

docs/01-membership.md

@@ -236,6 +236,7 @@ Individuals from active working groups produce the membership by opting into Pro
 | [Alex Vlasov](https://github.com/ericsson49/) | 1 | TXRX, [ethresear.ch/u/ericsson49](https://ethresear.ch/u/ericsson49), [ethereum/consensus-specs](https://github.com/ethereum/consensus-specs), [hackmd.io/@ericsson49](https://hackmd.io/@ericsson49) |
 | [danceratopz](https://github.com/danceratopz) | 1 | [ethereum/execution-spec-tests](https://github.com/ethereum/execution-spec-tests) |
 | [Felipe Selmo](https://github.com/fselmo/) | 1 | [ethereum/execution-spec-tests](https://github.com/ethereum/execution-spec-tests) |
+| [Felix Hoffmann](https://github.com/felix314159/) | 1 | [ethereum/execution-spec-tests](https://github.com/ethereum/execution-spec-tests) |
 | [Mario Vega](https://github.com/marioevz/) | 1 | [ethereum/execution-spec-tests](https://github.com/ethereum/execution-spec-tests) |
 | [Spencer Taylor-Brown](https://github.com/spencer-tb/) | 1 | [ethereum/execution-spec-tests](https://github.com/ethereum/execution-spec-tests) |
 |**EthereumJS** (3 contributors)| | |