update doc

Author: shenwei356

CHANGELOG.md

@@ -1,7 +1,7 @@
 - [csvtk v0.31.1](https://github.com/shenwei356/csvtk/releases/tag/v0.31.1)
 [![Github Releases (by Release)](https://img.shields.io/github/downloads/shenwei356/csvtk/v0.31.1/total.svg)](https://github.com/shenwei356/csvtk/releases/tag/v0.31.1)
     - `csvtk filter2/mutate2/mutate3`:
-        - fix the slow speed, I was stupid before. [#172](https://github.com/shenwei356/csvtk/issues/172)
+        - **fix the slow speed**, I was stupid before. [#172](https://github.com/shenwei356/csvtk/issues/172)
     - `csvtk csv2json`:
         - further fix values with double quotes and new line symbols. [#291](https://github.com/shenwei356/csvtk/issues/291)
 - [csvtk v0.31.0](https://github.com/shenwei356/csvtk/releases/tag/v0.31.0)

README.md

@@ -64,7 +64,7 @@ It could save you lots of time in (not) writing Python/R scripts.
 
 ## Subcommands
 
-53 subcommands in total.
+54 subcommands in total.
 
 **Information**
 

doc/docs/download.md

@@ -9,7 +9,7 @@
 - [csvtk v0.31.1](https://github.com/shenwei356/csvtk/releases/tag/v0.31.1)
 [![Github Releases (by Release)](https://img.shields.io/github/downloads/shenwei356/csvtk/v0.31.1/total.svg)](https://github.com/shenwei356/csvtk/releases/tag/v0.31.1)
     - `csvtk filter2/mutate2/mutate3`:
-        - fix the slow speed, I was stupid before. [#172](https://github.com/shenwei356/csvtk/issues/172)
+        - **fix the slow speed**, I was stupid before. [#172](https://github.com/shenwei356/csvtk/issues/172)
     - `csvtk csv2json`:
         - further fix values with double quotes and new line symbols. [#291](https://github.com/shenwei356/csvtk/issues/291)