adding mailchimp api regex

tokens/mailchimp-api-key.yaml

@@ -0,0 +1,21 @@
+id: aws-access-key-value
+
+info:
+  name: AWS Access Key ID Value
+  author: Swissky
+  severity: medium
+
+requests:
+  - method: GET
+    path:
+      - "{{BaseURL}}/"
+    matchers:
+      - type: regex
+        part: body
+        regex:
+          - "[0-9a-f]{32}-us[0-9]{1,2}"
+    extractors:
+      - type: regex
+        part: body
+        regex:
+          - "[0-9a-f]{32}-us[0-9]{1,2}"