Remove output handler -- we have a better, interactive thing now

matplotlib/patches/output_handler.patch

-diff -ur matplotlib-2.2.2/lib/matplotlib/figure.py matplotlib-2.2.2/lib/matplotlib/figure.py
---- a/lib/matplotlib/figure.py	2018-03-05 23:47:09.000000000 -0500
-+++ b/lib/matplotlib/figure.py	2018-05-17 10:46:52.355306452 -0400
-@@ -420,6 +420,17 @@
-             from matplotlib.backends import backend_webagg
-             return backend_webagg.ipython_inline_display(self)
-
-+    def _repr_html_(self):
-+        from js import document
-+        import io
-+        import base64
-+        png_data = io.BytesIO()
-+        self.savefig(png_data, format='png')
-+        img = document.createElement('img')
-+        img.src = 'data:image/png;base64,' + \
-+                  base64.b64encode(png_data.getvalue()).decode('ascii')
-+        return img
-+
-     def show(self, warn=True):
-         """
-         If using a GUI backend with pyplot, display the figure window.
\ No newline at end of file