Update docs.yaml

Author: Michael Penick

docs.yaml

@@ -52,7 +52,7 @@ links:
     href:  https://github.com/datastax/php-driver/releases
 versions:
   - name: 1.3
-    ref: HEAD
+    ref: v1.3.2
   - name: 1.2
     ref:  v1.2.0
   - name: 1.1