Import CodeMap in __init__ for backward compatibility

Author: d-ryzhykau

memory_profiler/__init__.py

@@ -17,6 +17,7 @@
 import warnings
 import contextlib
 
+from .code_map import CodeMap
 from .common import PY2, PY34, PY35, HAS_TRACEMALLOC
 from .utils import (
     show_results,