refactor(version): import only getFilename from eslint util

Author: ledsun

lib/util/version.js

@@ -11,7 +11,7 @@ const path = require('path');
 const resolve = require('resolve');
 const semver = require('semver');
 const error = require('./error');
-const eslintUtil = require('./eslint');
+const getFilename = require('./eslint').getFilename;
 
 const ULTIMATE_LATEST_SEMVER = '999.999.999';
 
@@ -29,7 +29,7 @@ function resetDetectedVersion() {
 
 function resolveBasedir(contextOrFilename) {
   if (contextOrFilename) {
-    const filename = typeof contextOrFilename === 'string' ? contextOrFilename : eslintUtil.getFilename(contextOrFilename);
+    const filename = typeof contextOrFilename === 'string' ? contextOrFilename : getFilename(contextOrFilename);
     const dirname = path.dirname(filename);
     try {
       if (fs.statSync(filename).isFile()) {