Manually specify commit hash to codecov

scripts/coverage.sh

@@ -3,5 +3,5 @@
 SOLIDITY_COVERAGE=true scripts/test.sh
 
 if [ "$CI" = true ]; then
-  curl -s https://codecov.io/bash | bash -s
+  curl -s https://codecov.io/bash | bash -s -- -C "$CIRCLE_SHA1"
 fi