README updated with some more dependencies

Author: marnovandermaas

readme.adoc

@@ -21,9 +21,13 @@ For guidelines on how to contribute, refer to the link:CONTRIBUTING.md[CONTRIBUT
 To build the document, you'll need the following tools installed on your system:
 
 * Make
-* asciiDoctor-pdf, asciidoctor-bibtex, asciidoctor-diagram, and asciidoctor-mathematical
 * Docker
+
+If you want to build outside of Docker, you'll need some more tools:
 * Python3
+* asciiDoctor-pdf, asciidoctor-bibtex, asciidoctor-diagram, asciidoctor-mathematical and asciidoctor-sail
+* bytefield-svg
+* wavedrom-cli
 
 === Cloning the Repository