use sha256sum because more secure

tests/test_cli/test.sh

@@ -20,8 +20,8 @@ function testExample() {
     abci-cli --log_level=error --verbose batch < "$INPUT" > "${INPUT}.out.new"
     killall "$3"
 
-    pre=$(shasum < "${INPUT}.out")
-    post=$(shasum < "${INPUT}.out.new")
+    pre=$(sha256sum < "${INPUT}.out")
+    post=$(sha256sum < "${INPUT}.out.new")
 
     if [[ "$pre" != "$post" ]]; then
         echo "You broke the tutorial"