feat(helm-docs): add Prerequisites section

helm-docs/src/commands/readme.rs

@@ -1,4 +1,5 @@
 use crate::chart::Chart;
+use crate::prerequisites::generate_prerequisites;
 use crate::table::generate_table;
 use crate::usage::generate_usage;
 use std::path::PathBuf;
@@ -14,6 +15,10 @@ impl Readme {
   pub fn exec(&self) {
     let chart = Chart::from(self.directory.join("Chart.yaml"));
     let values = self.directory.join("values.yaml");
+    println!("# {} Chart", chart.pretty_name);
+    println!("");
+    println!("## Prerequisites");
+    generate_prerequisites();
     println!("## Usage");
     generate_usage(chart);
     println!("## Configuration");

helm-docs/src/main.rs

@@ -3,6 +3,7 @@ use structopt::StructOpt;
 
 mod chart;
 mod commands;
+mod prerequisites;
 mod table;
 mod usage;
 

helm-docs/src/prerequisites.rs

@@ -0,0 +1,9 @@
+const PREREQUISITES: &str = r#"
+  * **Helm 3.2+** (Helm 2 is not supported)
+  * **Kubernetes 1.19+** - This is the earliest version of Kubernetes tested.
+    It is possible that this chart works with earlier versions but it is untested.
+"#;
+
+pub fn generate_prerequisites() {
+  println!("{}", PREREQUISITES)
+}