Mention 4.x in requirements and security

Author: voxpelli

SECURITY.md

@@ -4,6 +4,7 @@
 
 | Version | Supported          |
 | ------- | ------------------ |
+| 4.x.x   | :white_check_mark: |
 | 3.x.x   | :white_check_mark: |
 | 2.10.x  | :white_check_mark: |
 | < 2.10  | :x:                |

readme.md

@@ -11,6 +11,8 @@ checks which modules you have used in your code and then makes sure they are lis
 
 ## requirements
 
+dependency-check `4.x` supports Node.js 10 and later
+
 dependency-check `3.x` supports Node.js 6 and later
 
 dependency-check `2.x` supports Node.js 0.10 and later (Dev note: published using the `legacy` tag)