Revert "Use newer API to prevent deprecation warning"

This reverts commit 84fc518.

srsly/tests/msgpack/test_buffer.py

@@ -7,7 +7,7 @@
 def test_unpack_buffer():
     from array import array
     buf = array('b')
-    buf.frombytes(packb((b'foo', b'bar')))
+    buf.fromstring(packb((b'foo', b'bar')))
     obj = unpackb(buf, use_list=1)
     assert [b'foo', b'bar'] == obj
 

srsly/tests/msgpack/test_extension.py

@@ -40,15 +40,15 @@ def default(obj):
         print('default called', obj)
         if isinstance(obj, array.array):
             typecode = 123 # application specific typecode
-            data = obj.tobytes()
+            data = obj.tostring()
             return ExtType(typecode, data)
         raise TypeError("Unknown type object %r" % (obj,))
 
     def ext_hook(code, data):
         print('ext_hook called', code, data)
         assert code == 123
         obj = array.array('d')
-        obj.frombytes(data)
+        obj.fromstring(data)
         return obj
 
     obj = [42, b'hello', array.array('d', [1.1, 2.2, 3.3])]

srsly/tests/msgpack/test_memoryview.py

@@ -19,7 +19,7 @@ def make_array(f, data):
         return a
 
     def get_data(a):
-        return a.tobytes()
+        return a.tostring()
 else:
     make_memoryview = memoryview