Update binder references.

Author: alshan

README.md

@@ -140,7 +140,7 @@ using Lets-Plot Kotlin API in JVM and Kotlin/JS projects.
 
 * The "Example Notebooks" reference: [examples.md](https://github.com/JetBrains/lets-plot-kotlin/blob/master/docs/examples.md)
 
-* Example notebooks in the Binder: [mybinder.org](https://mybinder.org/v2/gh/JetBrains/lets-plot-kotlin/v4.3.0demos?filepath=docs/examples/jupyter-notebooks/)
+* Example notebooks in the Binder: [mybinder.org](https://mybinder.org/v2/gh/JetBrains/lets-plot-kotlin/v4.4.0demos1?filepath=docs/examples/jupyter-notebooks/)
 
 
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RELEASE.md

@@ -110,7 +110,7 @@ git add --all && git commit -m "Updated demo notebooks, add v1.2.3demos1 repo ta
 git tag v1.2.3demos1 && git push --tags
 ```
 
-In [docs/README.md](docs/README.md) update the Binder link with new "demo" tag (above).
+In [README.md](README.md) and [docs/README.md](docs/README.md) update the Binder link with new "demo" tag (above).
 
 ### Add the GitHub release:
 

docs/README.md

@@ -4,7 +4,7 @@
 
 * The "Example Notebooks" reference: [examples.md](https://github.com/JetBrains/lets-plot-kotlin/blob/master/docs/examples.md)
 
-* Example notebooks in the Binder: [mybinder.org](https://mybinder.org/v2/gh/JetBrains/lets-plot-kotlin/v4.3.0demos?filepath=docs/examples/jupyter-notebooks/)
+* Example notebooks in the Binder: [mybinder.org](https://mybinder.org/v2/gh/JetBrains/lets-plot-kotlin/v4.4.0demos1?filepath=docs/examples/jupyter-notebooks/)
 
 
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