fix(scripts): add validation for current dir

Author: azu

lib/scripts/create-textlint-rule.js

@@ -22,6 +22,9 @@ module.exports = function(projectName, options = {}) {
     const ruleName = isInitInCurrentDir
                      ? path.dirname(projectName)
                      : `textlint-rule-${projectName.replace(/^textlint-rule-/, "")}`;
+    if (isInitInCurrentDir && !/^textlint-rule-/.test(ruleName)) {
+        throw new Error(`Current directory name should start with "textlint-rule-<rule-name>".`);
+    }
     const ruleDir = isInitInCurrentDir ? options.cwd : path.join(options.cwd, ruleName);
     return spawn(`git`, [
         "clone", "--depth=1", "https://github.com/textlint/textlint-rule-template.git",