Commits on Feb 5, 2021

1. Optimize Sugar logger for calls with a single string arg …

   Currently, the Sugar logger uses fmt.Sprint in all cases when the
   template is empty. However, this call is unnecessary if there's
   a single string type argument, as we can use it directly.
   
   With this optimization, we reduce the cost and avoid an unnecessary
   alloc:
   ```
   > benchcmp pre post
   benchmark                         old ns/op     new ns/op     delta
   BenchmarkSugarSingleStrArg-10     636           570           -10.38%
   
   benchmark                         old allocs     new allocs     delta
   BenchmarkSugarSingleStrArg-10     1              0              -100.00%
   ```

   

   prashantv committed Feb 5, 2021
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