Update README.md

Author: tisztamo

README.md

@@ -9,7 +9,7 @@ Parse strings to Julia types securely (types only, not typed data!).
 Retrieving a type from a serialized string is a recurring task. Sometimes we can use Julia serialization, other times it is enough to store every serialized type in a dict, but if we want more flexibility, we need a parser. `eval()` solves the problem, but it has a huge cost: it is inherently insecure as it allows arbitrary code execution ([ACE on wikipedia](https://en.wikipedia.org/wiki/Arbitrary_code_execution)).
 
 TypeParsers takes the easy route and internally uses `eval()`. To mitigate the security issue we validate the string before evaluation.
-Validation is based on Tom Short's work: https://gist.github.com/tshort/3835660
+Validation is based on Tom Short's work: https://gist.github.com/tshort/3835660 (check the [validation tests](https://github.com/Circo-dev/TypeParsers.jl/blob/master/test/runtests.jl))
 
 ## Usage