fix web3 branch and update Dockerfile Ubuntu version 20.04

Author: elpiel

Cargo.lock

@@ -12,7 +12,9 @@ WORKDIR /usr/local/bin
 
 RUN cp $CARGO_HOME/bin/validator_worker .
 
-FROM ubuntu:18.04
+FROM ubuntu:20.04
+
+RUN apt update && apt-get install -y libssl-dev ca-certificates
 
 # `ethereum` or `dummy`
 ENV ADAPTER=
@@ -34,8 +36,6 @@ ENV SINGLE_TICK=
 
 WORKDIR /usr/local/bin
 
-RUN apt update && apt-get install -y libssl-dev ca-certificates
-
 COPY docs/config/cloudflare_origin.crt /usr/local/share/ca-certificates/
 
 RUN update-ca-certificates

Dockerfile

@@ -14,7 +14,7 @@ serde = { version = "^1.0", features = ['derive'] }
 serde_json = "1.0"
 serde-hex = "0.1.0"
 # Ethereum
-web3 = { git = "https://github.com/elpiel/rust-web3", branch = "export-ethabi" }
+web3 = { git = "https://github.com/tomusdrw/rust-web3" }
 eth_checksum = "0.1.1"
 tiny-keccak = "1.5"
 ethstore = { git = "https://github.com/elpiel/openethereum", branch = "remove-dir-depenedency-for-ethstore" }