added snyk badge

Author: toramanlis

readme.md

@@ -1 +1,3 @@
-[![codecov](https://codecov.io/gh/toramanlis/implicit-migrations/graph/badge.svg?token=BH5VBNIWMI)](https://codecov.io/gh/toramanlis/implicit-migrations)
+[![codecov](https://codecov.io/gh/toramanlis/implicit-migrations/graph/badge.svg?token=BH5VBNIWMI)](https://codecov.io/gh/toramanlis/implicit-migrations)
+
+[![Known Vulnerabilities](https://snyk.io/test/github/toramanlis/implicit-migrations/badge.svg)](https://snyk.io/test/github/toramanlis/implicit-migrations)