Add meta EIP for Metropolis/Byzantium

EIPS/eip-609.md

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+## Preamble
+
+    EIP: 609
+    Title: Hardfork Meta: Byzantium
+    Author: Alex Beregszaszi
+    Type: Standard Track
+    Category: Core
+    Status: Draft
+    Created: 2017-04-23
+    Requires: 100, 140, 196, 197, 198, 211, 214
+
+## Abstract
+
+This specifies the changes included in the hard fork named Byzantium.
+
+## Specification
+
+- Codename: Byzantium
+- Aliases: Metropolis/Byzantium, Metropolis part 1
+- Activation:
+  - Block not specified yet
+- Included EIPs:
+  - EIP 100 (Change difficulty adjustment to target mean block time including uncles)
+  - EIP 140 (REVERT instruction in the Ethereum Virtual Machine)
+  - EIP 196 (Precompiled contracts for addition and scalar multiplication on the elliptic curve alt_bn128)
+  - EIP 197 (Precompiled contracts for optimal ate pairing check on the elliptic curve alt_bn128)
+  - EIP 198 (Precompiled contract for bigint modular exponentiation)
+  - EIP 211 (New opcodes: RETURNDATASIZE and RETURNDATACOPY)
+  - EIP 214 (New opcode STATICCALL)
+  - EIP 658 (Embedding transaction return data in receipts)
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).