chore: fix a typo in README.md

README.md

@@ -65,7 +65,7 @@ byte[] seed = Mnemonic.toSeed(words, "");
 
 ### Checking Mnemonic Validity
 
-To check if a mnemonic sentence is valid, use the `isValid` method:
+To check if a mnemonic sentence is valid, use the `check` method:
 
 ```java
 String words = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";