Xenonpy

**Enhanced**

* Updated sample codes.
* Added progress bar for ngram training. ( 93 )
* Added error handling to NGram when generating new SMILES. ( 97 )

**CI**

* Removed python 3.5 support. ( 95 )
* Added Appveyor CI for windows tests. ( 90 )

**Enhanced**

* Add tutorials for main modules. ( 79 )

**Breaking changes**:

* Remove Built-in data ``mp_inorganic``, ``mp_structure``, ``oqmd_inorganic`` and ``oqmd_structure``. ( 12 20 )
* Change name of ``LocalStorage`` to ``Storage``.

**Enhanced**

* Add error handling for ``NGram`` training. ( 75 86 )
* Add error handling for ``IQSPR``. ( 69 )
* Add error handling for ``BaseDescriptor`` and ``BaseFeaturizer``. ( 73 )
* Add featurizer selection function. ( 47 )

**New Features**

* Add sample data building function for ``preset``. ( 81 84 )

This release fix some bugs in MDL and BaseDescriptor class.
There are no breaking changes.

This release fixed a bug