Update README.md
diff --git a/README.md b/README.md
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@@ -243,7 +243,7 @@
 information about the CPU and the date.
 The `benchmarks` attribute contains a list of ever benchmark run. Example json
 output looks like:
-```
+``` json
 {
   "context": {
     "date": "2015/03/17-18:40:25",