Rakuten: init support (#344)

data/hosts.yml

@@ -4027,6 +4027,21 @@ hosts:
       - ip: 192.229.189.142
         domain: www.quora.com
 
+  - name: Rakuten
+    items:
+      - ip: 133.237.50.6
+        domain: rd.rakuten.co.jp
+      - ip: 133.237.61.71
+        domain: esearch.rakuten.co.jp
+      - ip: 23.40.72.233
+        domain: www.rakuten.co.jp
+      - ip: 40.115.251.146
+        domain: globalexpress.rakuten.co.jp
+      - ip: 96.7.133.108
+        domains:
+          - books.rakuten.co.jp
+          - search.rakuten.co.jp
+
   - name: RawGit
     items:
       - ip: 198.232.125.81