Fix crc32c deprecation warning (#2128)

Fix a deprecation warning in the newest version.

Author: jeffwidman

kafka/record/util.py

@@ -2,7 +2,7 @@
 
 from kafka.record._crc32c import crc as crc32c_py
 try:
-    from crc32c import crc32 as crc32c_c
+    from crc32c import crc32c as crc32c_c
 except ImportError:
     crc32c_c = None
 

requirements-dev.txt

@@ -13,5 +13,5 @@ pylint==2.5.3
 pytest-pylint==0.17.0
 pytest-mock==1.10.0
 sphinx-rtd-theme==0.2.4
-crc32c==1.7
+crc32c==2.1
 py==1.8.0