Merge pull request #485 from paritytech/fix_asciiext

Removed AsciiExt import

README.md

@@ -33,7 +33,7 @@ Gitter [![Gitter https://gitter.im/paritytech/parity-bitcoin](https://badges.git
 
 Installing `pbtc` from source requires `rustc` and `cargo`.
 
-Minimal supported version is `rustc 1.16.0 (30cf806ef 2017-03-10)`
+Minimal supported version is `rustc 1.23.0 (766bd11c8 2018-01-01)`
 
 #### Install rustc and cargo
 

docker/hub/Dockerfile

@@ -2,7 +2,7 @@
 # See https://docs.docker.com/engine/userguide/eng-image/multistage-build/
 
 # Build image
-FROM rust:1.21-jessie AS build
+FROM rust:1.23-jessie AS build
 
 #ENV for build TAG
 ARG BUILD_TAG

docker/ubuntu/Dockerfile

@@ -3,7 +3,7 @@
 
 ### Base Image
 # Setup up a base image to use in Build and Runtime images
-FROM rust:1.21-jessie AS build
+FROM rust:1.23-jessie AS build
 
 # rustup directory
 ENV PATH=/root/.cargo/bin:$PATH \

message/src/common/command.rs

@@ -1,5 +1,4 @@
 use std::{str, fmt};
-use std::ascii::AsciiExt;
 use hash::H96;
 use Error;