Change permalink to relative link

Author: robin-aws

changes/2020-07-13_detect-base64-encoded-messages/change.md

@@ -7,9 +7,9 @@
 
 This serves as a reference of all features that this change affects.
 
-| Feature                                                                                                                                     |
-| ------------------------------------------------------------------------------------------------------------------------------------------- |
-| [Decrypt](https://github.com/awslabs/aws-encryption-sdk-specification/blob/623992d999db0b309d8a8adbd664f0d72feee813/client-apis/decrypt.md) |
+| Feature                                 |
+| --------------------------------------- |
+| [Decrypt](../../client-apis/decrypt.md) |
 
 ## Affected Specifications