Disable Travis in favor of Circle (OpenZeppelin#1866)

* replace readme badge

* remove travis config

* move to codecov

* add codecov config

* fix coverage running

.circleci/config.yml

@@ -62,9 +62,7 @@ jobs:
       - *npm_install_if_necessary
       - run:
           name: Unit tests with coverage report
-          command: npm run test
-          environment:
-            SOLIDITY_COVERAGE: true
+          command: npm run coverage
 
       # TODO(xinbenlv, #1839): run SOLC_NIGHTLY to be run but allow it to fail.
 

.codecov.yml

@@ -0,0 +1,3 @@
+comment: off
+coverage:
+  range: "100...100"

README.md

@@ -1,7 +1,7 @@
 # <img src="logo.png" alt="OpenZeppelin" height="40px">
 
 [![NPM Package](https://img.shields.io/npm/v/@openzeppelin/contracts.svg)](https://www.npmjs.org/package/@openzeppelin/contracts)
-[![Build Status](https://travis-ci.com/OpenZeppelin/openzeppelin-contracts.svg?branch=master)](https://travis-ci.com/OpenZeppelin/openzeppelin-contracts)
+[![Build Status](https://circleci.com/gh/OpenZeppelin/openzeppelin-contracts.svg?style=shield)](https://circleci.com/gh/OpenZeppelin/openzeppelin-contracts)
 [![Coverage Status](https://coveralls.io/repos/github/OpenZeppelin/openzeppelin-contracts/badge.svg?branch=master)](https://coveralls.io/github/OpenZeppelin/openzeppelin-contracts?branch=master)
 
 **OpenZeppelin Contracts is a library for secure smart contract development.** It provides implementations of standards like ERC20 and ERC721 which you can deploy as-is or extend to suit your needs, as well as Solidity components to build custom contracts and more complex decentralized systems.

package.json

@@ -46,7 +46,6 @@
   "devDependencies": {
     "chai": "^4.2.0",
     "concurrently": "^4.1.0",
-    "coveralls": "^3.0.1",
     "eslint": "^4.19.1",
     "eslint-config-standard": "^10.2.1",
     "eslint-plugin-import": "^2.13.0",

scripts/coverage.sh

@@ -1,3 +1,7 @@
 #!/usr/bin/env bash
 
 SOLIDITY_COVERAGE=true scripts/test.sh
+
+if [ "$CI" = true ]; then
+  curl -s https://codecov.io/bash | bash -s
+fi

scripts/test.sh

@@ -66,10 +66,6 @@ npx truffle version
 
 if [ "$SOLIDITY_COVERAGE" = true ]; then
   npx solidity-coverage
-
-  if [ "$CONTINUOUS_INTEGRATION" = true ]; then
-    cat coverage/lcov.info | npx coveralls
-  fi
 else
   npx truffle test "$@"
 fi