Add hamap resolver

dbxref/providers.yaml

@@ -7,6 +7,12 @@
   retriever:
       type: 'internal'
       location: 'dbxref.retrieve.enzyme'
+- name: HAMAP
+  prefixes: ["HAMAP"]
+  resources:
+      html: ["https://hamap.expasy.org/signature/%i"]
+      text: ["https://hamap.expasy.org/signature/%i.txt"]
+  check_existence: "https://hamap.expasy.org/signature/%i.txt"
 - name: Gene Identifier
   prefixes: ["GI"]
   resources: