set cwd of CLIEngine to process.cwd()

it seems it now defaults to '/' as the current working dir, but we
assume the cwd of the process

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

src/app.js

@@ -284,6 +284,7 @@ const cli = new eslint.CLIEngine({
     baseConfig: config,
     useEslintrc: true,
     fix: !!program.fix,
+    cwd: process.cwd(),
 });
 
 const report = cli.executeOnFiles(paths);