Update benchmark table formatting in README

Author: vitaut

README.md

@@ -216,26 +216,26 @@ in the following tables.
 
 **Optimized build (-O3)**
 
-| Method        | Compile Time, s | Executable size, KiB | Stripped size, KiB |
-|---------------|-----------------|----------------------|--------------------|
-| printf        |             1.6 |                   54 |                 50 |
-| IOStreams     |            28.4 |                   98 |                 84 |
-| fmt 1122268   |             5.0 |                   54 |                 50 |
-| tinyformat    |            32.6 |                  164 |                136 |
-| Boost Format  |            55.0 |                  530 |                317 |
+| Method          | Compile Time, s | Executable size, KiB | Stripped size, KiB |
+|-----------------|-----------------|----------------------|--------------------|
+| printf          |             1.6 |                   54 |                 50 |
+| IOStreams       |            28.4 |                   98 |                 84 |
+| {fmt} `1122268` |             5.0 |                   54 |                 50 |
+| tinyformat      |            32.6 |                  164 |                136 |
+| Boost Format    |            55.0 |                  530 |                317 |
 
 {fmt} is fast to compile and is comparable to `printf` in terms of per-call
 binary size (within a rounding error on this system).
 
 **Non-optimized build**
 
-| Method        | Compile Time, s | Executable size, KiB | Stripped size, KiB |
-|---------------|-----------------|----------------------|--------------------|
-| printf        |             1.4 |                   54 |                 50 |
-| IOStreams     |            27.0 |                   88 |                 68 |
-| {fmt} 1122268 |             4.7 |                   87 |                 84 |
-| tinyformat    |            28.1 |                  185 |                145 |
-| Boost Format  |            38.9 |                  678 |                381 |
+| Method          | Compile Time, s | Executable size, KiB | Stripped size, KiB |
+|-----------------|-----------------|----------------------|--------------------|
+| printf          |             1.4 |                   54 |                 50 |
+| IOStreams       |            27.0 |                   88 |                 68 |
+| {fmt} `1122268` |             4.7 |                   87 |                 84 |
+| tinyformat      |            28.1 |                  185 |                145 |
+| Boost Format    |            38.9 |                  678 |                381 |
 
 `libc`, `lib(std)c++`, and `libfmt` are all linked as shared libraries
 to compare formatting function overhead only. Boost Format is a