make plot importable (#130)

Author: anupriyatripathi

q2_qemistree/__init__.py

@@ -13,13 +13,14 @@
 from ._classyfire import get_classyfire_taxonomy
 from ._hierarchy import make_hierarchy
 from ._prune_hierarchy import prune_hierarchy
+from ._plot import plot
 from ._semantics import (MassSpectrometryFeatures, MGFDirFmt,
                          CSIFolder, CSIDirFmt, ZodiacFolder, ZodiacDirFmt,
                          SiriusFolder, SiriusDirFmt, OutputDirs)
 
 __all__ = ['compute_fragmentation_trees', 'rerank_molecular_formulas',
            'predict_fingerprints', 'make_hierarchy', 'get_classyfire_taxonomy',
-           'prune_hierarchy', 'MassSpectrometryFeatures', 'MGFDirFmt',
+           'prune_hierarchy', 'plot', 'MassSpectrometryFeatures', 'MGFDirFmt',
            'CSIFolder', 'CSIDirFmt', 'ZodiacFolder', 'ZodiacDirFmt',
            'SiriusFolder', 'SiriusDirFmt', 'OutputDirs']