fix typo

Signed-off-by: Deng Guangxing <denguangxing@huawei.com>

README.md

diff --git a/README.md b/README.md
index 6227b3f..973af3c 100644
--- a/README.md
+++ b/README.md
@@ -347,7 +347,7 @@
 
 #### Logger as an `io.Writer`
 
-Logrus can be transormed into an `io.Writer`. That writer is the end of an `io.Pipe` and it is your responsability to close it.
+Logrus can be transormed into an `io.Writer`. That writer is the end of an `io.Pipe` and it is your responsibility to close it.
 
 ```go
 w := logger.Writer()
@@ -366,7 +366,7 @@
 #### Rotation
 
 Log rotation is not provided with Logrus. Log rotation should be done by an
-external program (like `logrotated(8)`) that can compress and delete old log
+external program (like `logrotate(8)`) that can compress and delete old log
 entries. It should not be a feature of the application-level logger.