Mistake in ussage commands

[Nobuyuki Ishii]

I found a mistake in the usage commands.
This command does not work.

examples/blog/README.md

Lines 25 to 27 in 284f11c

 ```sh 
 yarn run install 
 ``` 

-yarn run install
+yarn install 

[Yusuke Wada]

Hi @YukiYuigishi !

I've fixed this issue. Thank you!