Remove revision number from top-level README

README.md

@@ -1,7 +1,5 @@
 # Ethereum flavored WebAssembly (ewasm)
 
-Specification **Revision 4**
-
 This repository contains documents describing the design and high-level overview of ewasm. Expect the contents of this repository to be in flux: everything is still under discussion.
 
 **This repository is also available through [ReadTheDocs](https://ewasm.readthedocs.io).**

contract_interface.md

@@ -2,6 +2,8 @@
 
 The Ewasm Contract Interface (ECI) specifies the structure of a contract module.
 
+Current revision: see [revision.md](./revision.md).
+
 ### Wire format
 
 Every contract must be stored in the [WebAssembly Binary Encoding](https://github.com/WebAssembly/design/blob/master/BinaryEncoding.md) format (in short, WASM bytecode).

eth_interface.md

@@ -2,6 +2,8 @@
 
 The Ethereum Environment Interface exposes the core Ethereum API to the ewasm environment. The Ethereum [module](https://github.com/WebAssembly/design/blob/master/Modules.md) will be implemented in the Ethereum client's native language. All parameters and returns are restricted to 32 or 64 bit integers. Floats are disallowed.
 
+Current revision: see [revision.md](./revision.md).
+
 # Data types
 
 We define the following Ethereum data types:

revision.md

@@ -0,0 +1,5 @@
+# Revision information
+
+**Current specification revision: 4**
+
+The contents of this branch describe this revision of the Ewasm design.

system_contracts.md

@@ -9,6 +9,8 @@ or to rely on implementations written in ewasm.
 Each of these contracts have a pre defined address and can be executed through
 regular contract invocations.
 
+Current revision: see [revision.md](./revision.md).
+
 ## Sentinel Contract
 
 Address: `0x000000000000000000000000000000000000000a`