Feature/vhs demo (#15)

* add vhs made demo gif

* add support for ANYDB_DB env var

* left one section

* fixed data type bug, added demo gifs, upgraded dependencies

---------

Co-authored-by: Thomas von Dein <tom@vondein.org>

demo/Makefile

@@ -0,0 +1,21 @@
+.PHONY: demo clean check clean-demo
+
+VHS  = vhs
+
+
+
+clean-demo:
+	rm -f local.db*
+
+%.gif: %.tape
+	@echo "vhs $<"
+	env PATH=..:$(PATH) ANYDB_DB=local.db vhs $<
+
+clean:
+	rm -vf *.db* *.json
+
+check:
+	ls -l ../anydb
+
+demo: check clean-demo intro.gif advanced.gif
+