Fix holoviews opts deprecation warning (#94)

* Updated holoviews option syntax to avoid deprecated API
* Fixed typos
* Removed windows 3.6 case from test suite due to lack of mamba support

.github/workflows/test.yaml

@@ -85,7 +85,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
+        os: ['ubuntu-latest', 'macos-latest']
         python-version: ['3.6']
     timeout-minutes: 60
     defaults:

colorcet/plotting.py

@@ -74,7 +74,7 @@ def swatches(*args, group=None, not_group=None, only_aliased=False, cols=None, *
               swatch(*arg, **kwargs) for
               arg in args]
 
-    plot = hv.Layout(images).opts(plot=dict(transpose=True)).cols(int(np.ceil(len(images)*1.0/cols)))
+    plot = hv.Layout(images).opts(transpose=True).cols(int(np.ceil(len(images)*1.0/cols)))
 
     if 'matplotlib' in backends:
         plot.opts(opts.Layout(backend='matplotlib', sublabel_format=None,
@@ -106,7 +106,7 @@ def sine_combs(*args, group=None, not_group=None, only_aliased=False, cols=1, **
               sine_comb(*arg, **kwargs) for
               arg in args]
 
-    plot = hv.Layout(images).opts(plot=dict(transpose=True)).cols(int(np.ceil(len(images)*1.0/cols)))
+    plot = hv.Layout(images).opts(transpose=True).cols(int(np.ceil(len(images)*1.0/cols)))
 
     backends = hv.Store.loaded_backends()
     if 'matplotlib' in backends:

examples/index.ipynb

@@ -85,8 +85,8 @@
     "For instance, mpl's colormaps are always perceptually uniform in their\n",
     "monochrome representation, not just their original color\n",
     "representation, and are safe for colorblind viewers, neither of which\n",
-    "are necessarily true of these colormaps.  On the other hand, colormaps\n",
-    "like \"fire\" above, i.e., a usable perceptually equivalent of\n",
+    "is necessarily true of these colormaps.  On the other hand, colormaps\n",
+    "like \"fire\" above, i.e., a usable perceptually equivalent version of\n",
     "matplotlib/matlab's \"hot\", are not obtainable using viscm in any\n",
     "straightforward way, limiting the range of useful colormaps that can be created.\n",
     "In any case, this package focuses on making a set of useful colormaps\n",