replace '`' by 'your' prefix

Author: lucasribolli

README.md

@@ -2,10 +2,10 @@
 
 Show only modified files in a specific commit id:
 ```
-git diff-tree --no-commit-id --name-only -r `commit id`
+git diff-tree --no-commit-id --name-only -r your-commit-id
 ```
 
 Find commit from case sensitive keyword:
 ```
-git log --grep="`keyword`"
+git log --grep="your-keyword"
 ```