Disable Travis in favor of Circle (#1866)

* replace readme badge

* remove travis config

* move to codecov

* add codecov config

* fix coverage running

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