Fix import regression + bump

Author: kishorenc

setup.py

@@ -7,7 +7,7 @@
 setup(
     name='typesense',
     python_requires='>=3',
-    version='0.15.0',
+    version='0.15.1',
     packages=['examples', 'typesense'],
     install_requires=['requests'],
     url='https://typesense.org',

typesense/documents.py

@@ -55,7 +55,7 @@ def import_jsonl(self, documents_jsonl):
     # `documents` can be either a list of document objects (or)
     #  JSONL-formatted string containing multiple documents
     def import_(self, documents, params=None, batch_size=None):
-        if isinstance(documents, Iterable):
+        if isinstance(documents, Iterable) and not isinstance(documents, (str, bytes)):
             if batch_size:
                 response_objs = []
                 batch = []