[README] Update version Compatibility with Elasticsearch (elastic#116040

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Co-authored-by: Kibana Machine <[email protected]>

README.md

@@ -49,13 +49,13 @@ _Note: The version numbers below are only examples, meant to illustrate the rela
 
 | Situation                 | Example Kibana version     | Example ES version | Outcome |
 | ------------------------- | -------------------------- |------------------- | ------- |
-| Versions are the same.    | 5.1.2                      | 5.1.2              | 💚 OK      |
-| ES patch number is newer. | 5.1.__2__                  | 5.1.__5__          | ⚠️ Logged warning      |
-| ES minor number is newer. | 5.__1__.2                  | 5.__5__.0          | ⚠️ Logged warning      |
-| ES major number is newer. | __5__.1.2                  | __6__.0.0          | 🚫 Fatal error      |
-| ES patch number is older. | 5.1.__2__                  | 5.1.__0__          | ⚠️ Logged warning      |
-| ES minor number is older. | 5.__1__.2                  | 5.__0__.0          | 🚫 Fatal error      |
-| ES major number is older. | __5__.1.2                  | __4__.0.0          | 🚫 Fatal error      |
+| Versions are the same.    | 7.15.1                     | 7.15.1             | 💚 OK      |
+| ES patch number is newer. | 7.15.__0__                 | 7.15.__1__         | ⚠️ Logged warning      |
+| ES minor number is newer. | 7.__14__.2                 | 7.__15__.0         | ⚠️ Logged warning      |
+| ES major number is newer. | __7__.15.1                 | __8__.0.0          | 🚫 Fatal error      |
+| ES patch number is older. | 7.15.__1__                 | 7.15.__0__         | ⚠️ Logged warning      |
+| ES minor number is older. | 7.__15__.1                 | 7.__14__.2         | 🚫 Fatal error      |
+| ES major number is older. | __8__.0.0                  | __7__.15.1         | 🚫 Fatal error      |
 
 ## Questions? Problems? Suggestions?