Update SECURITY.md (#3151)

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

Author: sanketsudake

SECURITY.md

@@ -6,12 +6,12 @@ Please refer using [latest stable release](https://github.com/fission/fission/re
 
 | Version | Supported          |
 | ------- | ------------------ |
-| >=1.14.x   | :white_check_mark: |
-| < 1.14.0   | :x:                |
+| >=1.20.x   | :white_check_mark: |
+| < 1.20.0   | :x:                |
 
 ## Reporting a Vulnerability
 
 Please send the details to both of us:
 
-- Sanket Sudake sanket@infracloud.io
-- Vishal Biyani vishal@infracloud.io
+- Sanket Sudake sanket[at]infracloud.io
+- Vishal Biyani vishal[at]infracloud.io