Remove unused ERC20_ENABLED

This is never read since https://github.com/cosmos/cosmjs/pull/701

.circleci/config.yml

@@ -152,7 +152,6 @@ jobs:
           name: Run tests
           environment:
             LAUNCHPAD_ENABLED: 1
-            ERC20_ENABLED: 1
             TENDERMINT_ENABLED: 1
             SOCKETSERVER_ENABLED: 1
             SKIP_BUILD: 1
@@ -273,7 +272,6 @@ jobs:
       - run:
           environment:
             LAUNCHPAD_ENABLED: 1
-            ERC20_ENABLED: 1
             SIMAPP42_ENABLED: 1
             SLOW_SIMAPP42_ENABLED: 1
             TENDERMINT_ENABLED: 1
@@ -389,7 +387,6 @@ jobs:
       - run:
           environment:
             LAUNCHPAD_ENABLED: 1
-            ERC20_ENABLED: 1
             SIMAPP42_ENABLED: 1
             SLOW_SIMAPP42_ENABLED: 1
             TENDERMINT_ENABLED: 1
@@ -491,7 +488,6 @@ jobs:
       - run:
           environment:
             LAUNCHPAD_ENABLED: 1
-            ERC20_ENABLED: 1
             SIMAPP42_ENABLED: 1
             SLOW_SIMAPP42_ENABLED: 1
             TENDERMINT_ENABLED: 1

HACKING.md

@@ -55,7 +55,6 @@ multiple versions of raw Tendermint and a basic WebSocket server.
 ./scripts/launchpad/start.sh
 ./scripts/launchpad/init.sh
 export LAUNCHPAD_ENABLED=1
-export ERC20_ENABLED=1
 
 # Start Tendermint
 ./scripts/tendermint/all_start.sh
@@ -71,7 +70,6 @@ yarn test
 # And at the end of the day
 unset SOCKETSERVER_ENABLED
 unset TENDERMINT_ENABLED
-unset ERC20_ENABLED
 unset LAUNCHPAD_ENABLED
 ./scripts/socketserver/stop.sh
 ./scripts/tendermint/all_stop.sh

packages/cosmwasm-stargate/webpack.web.config.js

@@ -18,7 +18,6 @@ module.exports = [
     plugins: [
       new webpack.EnvironmentPlugin({
         WASMD_ENABLED: "",
-        ERC20_ENABLED: "",
       }),
       new webpack.ProvidePlugin({
         Buffer: ["buffer", "Buffer"],