Update docs

scripts/generate/run.js

@@ -8,7 +8,7 @@ const format = require('./format-lines');
 function getVersion(path) {
   try {
     return fs.readFileSync(path, 'utf8').match(/\/\/ OpenZeppelin Contracts \(last updated v[^)]+\)/)[0];
-  } catch (err) {
+  } catch {
     return null;
   }
 }