Update to reveal.js 4.1.2 (#136)

- New tools/ script to manually keep step for updates
- Plugins are all updated
- Template update following latest Pandoc version
- updated README for documentation
- Help page updated 
- See other change in NEWS file
diff --git a/inst/reveal.js-4.1.2/plugin/customcontrols/VERSION b/inst/reveal.js-4.1.2/plugin/customcontrols/VERSION
new file mode 100644
index 0000000..b1cbc1f
--- /dev/null
+++ b/inst/reveal.js-4.1.2/plugin/customcontrols/VERSION
@@ -0,0 +1 @@
+4.1.5