Remove Travis CI (#6)

.travis.yml

-# Request an environment that provides sudo (that goes with larger containers)
-# and a minimal language environment.
-sudo: true
-language: minimal
-
-cache: cargo
-
-branches:
-  only:
-  - master
-
-env:
-  global:
-    - RUST_BACKTRACE=1
-
-before_install:
-  # Check how much space we've got on this machine.
-  - df -h
-
-script:
-  - ./scripts/ci.sh
-
-after_script:
-  # Check how much free disk space left after the build
-  - df -h

README.md

 # Substrate Shasper
 
-[![Build Status](https://travis-ci.org/paritytech/shasper.svg?branch=master)](https://travis-ci.org/paritytech/shasper)
-
 *Note: This is an experimental project. Everything will break, and it may disappear without any notice!*
 
 This is an implementation of [Shasper](https://github.com/ethereum/eth2.0-specs) beacon chain using the [Substrate framework](https://github.com/paritytech/substrate).