no addition in readme

Author: liyang wang

README.md

@@ -4,24 +4,6 @@ Cert Manager's ACME (automated certificate management environment) issuer type s
 to implement custom DNS01 challenge solving logic.
 
 IBM Cloud Internet Services is not officially supported in cert-manager core, so if you want to automatically provision certificates with cert-manager using DNS challenges, you can use this repository to do so.
-=======
-This is useful if you need to use cert-manager with a DNS provider that is not
-officially supported in cert-manager core.
-
-## Why not in core?
-
-As the project & adoption has grown, there has been an influx of DNS provider
-pull requests to our core codebase. As this number has grown, the test matrix
-has become un-maintainable and so, it's not possible for us to certify that
-providers work to a sufficient level.
-
-By creating this 'interface' between cert-manager and DNS providers, we allow
-users to quickly iterate and test out new integrations, and then packaging
-those up themselves as 'extensions' to cert-manager.
-
-We can also then provide a standardised 'testing framework', or set of
-conformance tests, which allow us to validate that a DNS provider works as
-expected.
 
 ## Usage
 
@@ -55,16 +37,16 @@ spec:
       name: letsencrypt
     server: https://acme-v02.api.letsencrypt.org/directory
     solvers:
-    - dns01:
-        webhook:
-          config:
-            ibmCloudCisCrns:
-            - 'crn:v1:bluemix:public:internet-svcs:global:a/***:***::'
-          groupName: acme.skills.network
-          solverName: ibm-cloud-cis
-      selector:
-        dnsZones:
-        - your.site.domain.com
+      - dns01:
+          webhook:
+            config:
+              ibmCloudCisCrns:
+                - "crn:v1:bluemix:public:internet-svcs:global:a/***:***::"
+            groupName: acme.skills.network
+            solverName: ibm-cloud-cis
+        selector:
+          dnsZones:
+            - your.site.domain.com
 ```
 
 After update your issuer, cert-manager should be able to automatically complete challenges for your certificates on IBM CIS-managed domains.