use secure version of parsedown

taylorotwell · taylorotwell · commit 816f893c3015 · 2018-02-28T08:50:24.000-06:00
diff --git a/composer.json b/composer.json
@@ -20,7 +20,7 @@
         "ext-openssl": "*",
         "doctrine/inflector": "~1.1",
         "dragonmantank/cron-expression": "~2.0",
-        "erusev/parsedown": "~1.6",
+        "erusev/parsedown": "~1.7",
         "league/flysystem": "~1.0",
         "monolog/monolog": "~1.12",
         "nesbot/carbon": "^1.22.1",
