Update META.json

Standardization of META.json, we don't need to create a new version here because new updates have been deploy since the last publish on pgxn

META.json

@@ -1,16 +1,18 @@
 {
    "name": "pgtelemetry",
    "abstract": "Useful monitoring and metrics views for PostgreSQL",
-   "version": "1.4.0",
-   "maintainer": [ "Chris Travers <[email protected]>" ],
+   "version": "1.6.0",
+   "maintainer" : [
+      "adjustgmbh"
+   ],
    "license": {
       "PostgreSQL": "http://www.postgresql.org/about/licence"
    },
    "provides": { 
       "pgtelemetry": {
          "file": "extension/pgtelemetry-HEAD.sql",
          "docfile": "doc/pgtelemetry.html",
-         "version": "1.4.0",
+         "version": "1.6.0",
          "abstract": "Useful monitoring and metrics for PostgreSQL"
       }
    },
@@ -23,7 +25,7 @@
    "prereqs": {
       "runtime": {
         "requires": {
-           "PostgreSQL": "9.6.0",
+           "PostgreSQL": "11.0.0",
            "pg_stat_statements": 0,
            "plpgsql": 0
         }