Removed Mage_PageCache module (#2258)

Author: fballiano

.github/phpstan.neon

@@ -43,7 +43,6 @@ parameters:
          - %currentWorkingDirectory%/app/code/core/Mage/Newsletter
          - %currentWorkingDirectory%/app/code/core/Mage/Oauth
          - %currentWorkingDirectory%/app/code/core/Mage/Page
-         - %currentWorkingDirectory%/app/code/core/Mage/PageCache
          - %currentWorkingDirectory%/app/code/core/Mage/Paygate
          - %currentWorkingDirectory%/app/code/core/Mage/Payment
          - %currentWorkingDirectory%/app/code/core/Mage/Paypal

README.md

@@ -93,6 +93,7 @@ Do not use 20.x.x if you need IE support.
 - possibility to disable global search in backend #1532
 - reduce needless saves by avoiding setting `_hasDataChanges` flag #2066
 - removed support for `global/sales/old_fields_map` defined in XML #921
+- removed Mage_PageCache module #2258
 - removed lib/flex containing unused ActionScript "file uploader" files #2271
 
 For full list of changes, you can [compare tags](https://github.com/OpenMage/magento-lts/compare/1.9.4.x...20.0).