Update README.md

Added example setting to maxBuffer option for clarity
sun-zheng-an · Sep 21, 2016 · 7491e27 · 7491e27
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@@ -140,6 +140,8 @@ default: 16MB(16 * 1024 * 1024)
 
 You won't need to set this option unless you encounter a "stdout maxBuffer exceeded" error.
 
+For example, setting it to `16 * 1024 * 1024` will result in 16MB.
+
 #### options.timeout
 
 type: `Number`