Make the ruby_version and rails_version fields of the Cli struct non-optional.

This is because the default values are already set in the struct definition.

Author: rafaelfranca

src/main.rs

@@ -16,8 +16,8 @@ fn main() {
     // read the content of the DOCKERFILE and store it in a variable
     let dockerfile = include_bytes!("../Dockerfile");
 
-    let ruby_version = cli.ruby_version.unwrap();
-    let rails_version = cli.rails_version.unwrap();
+    let ruby_version = cli.ruby_version;
+    let rails_version = cli.rails_version;
 
     // Run docker build --build-arg RUBY_VERSION=$RUBY_VERSION --build-arg RAILS_VERSION=$RAILS_VERSION -t rails-new-$RUBY_VERSION-$RAILS_VERSION
     // passing the content of DOCKERFILE to the command stdin

src/rails_new.rs

@@ -7,9 +7,9 @@ pub struct Cli {
     /// arguments passed to `rails new`
     pub args: Vec<String>,
     #[clap(long, short = 'u', default_value = "3.2.3")]
-    pub ruby_version: Option<String>,
+    pub ruby_version: String,
     #[clap(long, short = 'r', default_value = "7.1.3")]
-    pub rails_version: Option<String>,
+    pub rails_version: String,
 }
 
 #[test]