commitlint.config: fix rule config severity

Using Error status for severity of body-leading-blank rule.

commitlint.config.ts

@@ -8,7 +8,7 @@ let headerMaxLineLength = 50;
 module.exports = {
     parserPreset: "conventional-changelog-conventionalcommits",
     rules: {
-        "body-leading-blank": [RuleConfigSeverity.Warning, "always"],
+        "body-leading-blank": [RuleConfigSeverity.Error, "always"],
         "body-soft-max-line-length": [
             RuleConfigSeverity.Error,
             "always",
@@ -46,7 +46,6 @@ module.exports = {
         // * Reject some stupid obvious words: change, update, modify (if first word after colon, error; otherwise warning).
         // * Think of how to reject this shitty commit message: https://github.com/nblockchain/NOnion/pull/34/commits/9ffcb373a1147ed1c729e8aca4ffd30467255594
         // * Title should not have dot at the end.
-        // * Second line of commit msg should always be blank.
         // * Workflow: detect if wip commit in a branch not named "wip/*" or whose name contains "squashed".
         // * Detect if commit hash mention in commit msg actually exists in repo.
         // * Detect area(sub-area) in the title that doesn't include area part (e.g., writing (bar) instead of foo(bar))