Fixed Aaron's typo, added credits section

Author: phillmv

gems/actionview/CVE-2019-5419.yml

@@ -8,7 +8,7 @@ url: https://groups.google.com/forum/#!topic/rubyonrails-security/GN7w9fFAQeI
 title: Denial of Service Vulnerability in Action View
 
 description: |
-  There is a potential denial of service vulnerability in MODULE / COMPONENT.
+  There is a potential denial of service vulnerability in actionview.
   This vulnerability has been assigned the CVE identifier CVE-2019-5419.
 
   Impact
@@ -81,6 +81,11 @@ description: |
     end
   end)
   ```
+  
+  Credits 
+  ------- 
+  Thanks to John Hawthorn <john@hawthorn.email> of GitHub 
+
 
 patched_versions:
   - ">= 6.0.0.beta3"