Keep HTML line breaks

They do appear in long_description on au_prod.

app/services/html_sanitizer.rb

@@ -9,7 +9,7 @@ class HtmlSanitizer
   def self.sanitize(html)
     @sanitizer ||= Rails::HTML5::SafeListSanitizer.new
     @sanitizer.sanitize(
-      html, tags: %w[h1 h2 h3 h4 p b i u a], attributes: %w[href target],
+      html, tags: %w[h1 h2 h3 h4 p br b i u a], attributes: %w[href target],
     )
   end
 end

spec/services/html_sanitizer_spec.rb

@@ -12,9 +12,9 @@ RSpec.describe HtmlSanitizer do
   end
 
   it "keeps supported tags" do
-    html = "Hello <b>alert</b>!"
+    html = "Hello <b>alert</b>! <br>How are you?"
     expect(subject.sanitize(html))
-      .to eq "Hello <b>alert</b>!"
+      .to eq "Hello <b>alert</b>! <br>How are you?"
   end
 
   it "keeps supported attributes" do