Type fix and readme update

Author: sbrugman

README.md

@@ -14,6 +14,9 @@ expand_address('Quatre vingt douze Ave des Champs-Élysées')
 
 from postal.parser import parse_address
 parse_address('The Book Club 100-106 Leonard St, Shoreditch, London, Greater London, EC2A 4RH, United Kingdom')
+
+from postal.lang_classifier import classify_lang_address
+classify_lang_address('Quatre vingt douze Ave des Champs-Élysées')
 ```
 
 Installation

postal/pylangclassifier.c

@@ -40,7 +40,7 @@ static PyObject *py_classify_lang_address(PyObject *self, PyObject *args, PyObje
         return NULL;
     }
 
-    libpostal_language_classifier_response_t *response = libpostal_classify_language(input);
+    language_classifier_response_t *response = libpostal_classify_language(input);
 
     if (response == NULL) {
         goto exit_free_input;