docs: Changelog (and py2 fix)

Author: henryiii

docs/CHANGELOG.md

@@ -5,18 +5,21 @@
 
 #### User changes
 
-* Arbitrary items can be set on an axis or histogram. [#450][]
+* Arbitrary items can be set on an axis or histogram. [#450][], [#456][]
+* Subclasses can customize the conversion procedure. [#456][]
 
 #### Bug fixes
 
 * Fixed reading pickles from boost-histogram 0.6-0.8 [#445][]
 * Minor correctness fix [#446][]
 * Accidental install of typing on Python 3.5+ fixed
+* Scalar ND fill fixed [#453][]
 
 #### Developer changes
 * Updated to Boost 1.74 [#442][]
 * CMake installs version.py now too [#449][]
 * Updated setuptools infrastructure no longer requires NumPy [#451][]
+* Some basic clang-tidy checks are now being run [#455][]
 
 
 [#442]: https://github.com/scikit-hep/boost-histogram/pull/442
@@ -25,6 +28,9 @@
 [#449]: https://github.com/scikit-hep/boost-histogram/pull/449
 [#450]: https://github.com/scikit-hep/boost-histogram/pull/450
 [#451]: https://github.com/scikit-hep/boost-histogram/pull/451
+[#453]: https://github.com/scikit-hep/boost-histogram/pull/453
+[#455]: https://github.com/scikit-hep/boost-histogram/pull/455
+[#456]: https://github.com/scikit-hep/boost-histogram/pull/456
 
 
 ## Version 0.10

tests/test_minihist_title.py

@@ -35,7 +35,7 @@ def __getitem__(self, item):
         else:
             item = self._get_index_by_name(item)
 
-        return super().__getitem__(item)
+        return super(NamedAxesTuple).__getitem__(item)
 
     @property
     def name(self):
@@ -70,7 +70,7 @@ def __init__(
         self, bins, start, stop, name,
     ):
 
-        super().__init__(
+        super(Regular, self).__init__(
             bins, start, stop,
         )
 
@@ -83,7 +83,7 @@ def _generate_axes_(self):
         return NamedAxesTuple(self._axis(i) for i in range(self.ndim))
 
     def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
+        super(CustomHist, self).__init__(*args, **kwargs)
         valid_names = [ax.name for ax in self.axes if ax.name]
         if len(valid_names) != len(set(valid_names)):
             msg = "{} instance cannot contain axes with duplicated names".format(