duplicate 2020-10-20 api-version onto 2020-02-12 api-version (#13062)

Author: tonykslee

specification/applicationinsights/resource-manager/readme.md

@@ -203,6 +203,28 @@ directive:
     reason: 'Previously implemented operation apis are using an incorrect RP case format which I cannot change.'
 ```
 
+### Tag: package-2020-02-12
+
+These settings apply only when `--tag=package-2020-02-12` is specified on the command line.
+
+``` yaml $(tag) == 'package-2020-02-12'
+input-file:
+  - Microsoft.Insights/stable/2015-05-01/analyticsItems_API.json
+  - Microsoft.Insights/stable/2015-05-01/componentAnnotations_API.json
+  - Microsoft.Insights/stable/2015-05-01/componentApiKeys_API.json
+  - Microsoft.Insights/stable/2015-05-01/componentContinuousExport_API.json
+  - Microsoft.Insights/stable/2015-05-01/componentFeaturesAndPricing_API.json
+  - Microsoft.Insights/stable/2015-05-01/componentProactiveDetection_API.json
+  - Microsoft.Insights/stable/2015-05-01/components_API.json
+  - Microsoft.Insights/stable/2015-05-01/componentWorkItemConfigs_API.json
+  - Microsoft.Insights/stable/2015-05-01/favorites_API.json
+  - Microsoft.Insights/stable/2015-05-01/webTestLocations_API.json
+  - Microsoft.Insights/stable/2015-05-01/webTests_API.json
+  - Microsoft.Insights/stable/2020-10-20/myworkbooks_API.json
+  - Microsoft.Insights/stable/2020-10-20/workbooks_API.json
+  - Microsoft.Insights/stable/2020-10-20/workbookOperations_API.json
+```
+
 ### Tag: package-2020-10-20
 
 These settings apply only when `--tag=package-2020-10-20` is specified on the command line.