notifiers: Generate Bash completions

Author: StenAL

Formula/n/notifiers.rb

@@ -85,7 +85,8 @@ class Notifiers < Formula
   def install
     virtualenv_install_with_resources
 
-    generate_completions_from_executable(bin/"notifiers", shells: [:fish, :zsh], shell_parameter_format: :click)
+    generate_completions_from_executable(bin/"notifiers",
+                                         shells: [:bash, :fish, :zsh], shell_parameter_format: :click)
   end
 
   test do