Update library.json - general housekeeping

library.json

@@ -1,6 +1,5 @@
 {
   "name": "nlohmann-json",
-  "version": "3.11.2",
   "description": "JSON for Modern C++",
   "keywords": [
     "json",
@@ -8,7 +7,8 @@
     "deserialization",
     "parser",
     "generator",
-    "C++"
+    "C++",
+    "modern"
   ],
   "authors": [
     {
@@ -30,7 +30,6 @@
     "https://github.com/nlohmann/json/tree/develop/docs/examples"
   ],
   "build": {
-    "flags": ["-std=c++11"],
     "srcFilter": ["-<**/*>"],
     "includeDir": "single_include"
   }