Add bpdb to debug_statements_hook

This patch adds the bpython debugger import `bpdb` to the
debug_statements_hook.

pre_commit_hooks/debug_statement_hook.py

diff --git a/pre_commit_hooks/debug_statement_hook.py b/pre_commit_hooks/debug_statement_hook.py
index 9ada657..cf544c7 100644
--- a/pre_commit_hooks/debug_statement_hook.py
+++ b/pre_commit_hooks/debug_statement_hook.py
@@ -8,6 +8,7 @@
 
 
 DEBUG_STATEMENTS = {
+    'bpdb',
     'ipdb',
     'pdb',
     'pdbr',