add pr entry

docs/source/whatsnew/pr/expose-pdb-api.rst

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+Expose Pdb API
+===================
+
+Expose the built-in ``pdb.Pdb`` API. ``Pdb`` constructor arguments are generically 
+exposed, regardless of python version.
+Newly exposed arguments:
+
+- ``skip``  - Python 3.1+
+- ``nosiginnt`` - Python 3.2+
+- ``readrc`` - Python 3.6+
+
+Try it out::
+
+    from IPython.terminal.debugger import TerminalPdb
+    pdb = TerminalPdb(skip=["skipthismodule"])