Bump @prisma/client peer dependency

Author: queicherius

package.json

@@ -21,7 +21,7 @@
     "graphql-fields": "2.0.3"
   },
   "peerDependencies": {
-    "@prisma/client": "^2.0.0 || ^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0"
+    "@prisma/client": ">=2.0.0"
   },
   "devDependencies": {
     "@devoxa/eslint-config": "4.0.2",