Change composer requirement to typo3/cms-core

Requirement should be for typo3/cms-core instead of typo3/cms. Starting with TYPO3 V9 it MUST be typo3/cms-core

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--- web/typo3conf/ext/pb_social/composer.json   (date 1533210525640)
+++ web/typo3conf/ext/pb_social/composer.json   (date 1533210525640)
@@ -12,7 +12,7 @@
     "Social Media Streams"
   ],
   "require": {
-    "typo3/cms": "^6.2.14 || ^7.6.0 || ^8.7.0",
+    "typo3/cms-core": "^6.2.14 || ^7.6.0 || ^8.7.0",
     "php": ">=5.4.0"
   },
   "autoload": {

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