Merge pull request #5 from oliversalzburg/fix/emit

Remove redundant emit call

Author: niftylettuce

src/index.js

@@ -4,7 +4,6 @@ const koa404Handler = async (ctx, next) => {
     if (ctx.status === 404) ctx.throw(404);
   } catch (err) {
     ctx.throw(err);
-    ctx.app.emit('error', err, ctx);
   }
 };