tests: Add test for min. cetz version compat

.gitignore

@@ -1 +1,2 @@
 /tests/**/*.pdf
+/tests/**/out/*

README.md

@@ -1,6 +1,6 @@
 # CeTZ Venn
 
-A CeTZ library for drawing simple two- or three-set Venn diagrams.
+A [CeTZ](https://github.com/cetz-package/cetz) library for drawing simple two- or three-set Venn diagrams.
 
 ## Examples
 <!-- img width is set so the table gets evenly spaced by GitHubs css -->
@@ -24,11 +24,13 @@ A CeTZ library for drawing simple two- or three-set Venn diagrams.
 
 ## Usage
 
-For information, see the [manual (stable)](https://github.com/johannes-wolf/cetz-venn/blob/stable/manual.pdf?raw=true).
+This package requires CeTZ version >= 0.2.0!
+
+For information, see the [manual (stable)](https://github.com/cetz-package/cetz-venn/blob/stable/manual.pdf?raw=true).
 
 To use this package, simply add the following code to your document:
 ```
-#import "@preview/cetz:0.2.1"
+#import "@preview/cetz:0.2.2"
 #import "@preview/cetz-venn:0.1.0"
 
 #cetz.canvas({

tests/cetz-version/test.typ

@@ -0,0 +1,16 @@
+#set page(width: auto, height: auto)
+#import "/src/lib.typ": venn2, venn3
+#import "/tests/helper.typ": *
+
+// Import the minimum supported cetz version
+#import "@preview/cetz:0.2.0"
+
+#import cetz.draw: content, set-style
+
+#test-case({
+  venn2()
+})
+
+#test-case({
+  venn3()
+})