Add more v1.x changes in readme

EXAMPLES.md

@@ -1,6 +1,8 @@
 ## Examples
 [Detect MIME type](#detect)
+
 [Check against MIME type](#check)
+
 [Check base MIME type](#check-parent)
 
 ### Detect
@@ -52,9 +54,3 @@ fmt.Println(isText, err)
 
 // Output: true <nil>
 ```
-When calling `DetectReader` on a `ReadSeeker` interface, such as `os.File`, make sure
-to reset the offset of the reader to the beginning if needed:
-```go
-_, err = file.Seek(0, io.SeekStart)
-```
-

README.md

@@ -41,9 +41,12 @@ In v1.x the detect functions no longer return the MIME type and extension as
 strings. Instead they return a [MIME](https://godoc.org/github.com/gabriel-vasile/mimetype#MIME)
 struct. To get the string value of the MIME and the extension, call the
 `String()` and the `Extension()` methods.
-In order to play better with the stdlib `mime` package, v1.x extensions
+
+In order to play better with the stdlib `mime` package, v1.x file extensions
 include the leading dot, as in ".html".
 
+In v1.x the `text/plain` MIME type is `text/plain; charset=utf-8`.
+
 ## Supported MIME types
 See [supported mimes](supported_mimes.md) for the list of detected MIME types.
 If support is needed for a specific file format, please open an [issue](https://github.com/gabriel-vasile/mimetype/issues/new/choose).