Update contributing.rst

[ghost]

Fixes #55

Tasks

• PR is descriptively titled 📑 and links the original issue above 🔗
• Tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR
  Run tests locally to check for errors.
• Commits are in uniquely-named feature branch and has no merge conflicts 📁
  This is commit message
  Signed-off-by : akshaydayma akshaydayma50@gmail.com

[ghost]

Fixes #55

Tasks

• PR is descriptively titled bookmark_tabs and links the original issue above link
• Tests pass -- look for a green checkbox heavy_check_mark a few minutes after opening your PR
  Run tests locally to check for errors.
• Commits are in uniquely-named feature branch and has no merge conflicts file_folder
  This is commit message
  Signed-off-by : akshaydayma akshaydayma50@gmail.com

[ghost]

Fixes #55

Tasks

• PR is descriptively titled bookmark_tabs and links the original issue above link
• Tests pass -- look for a green checkbox heavy_check_mark a few minutes after opening your PR
  Run tests locally to check for errors.
• Commits are in uniquely-named feature branch and has no merge conflicts file_folder
  This is commit message
  Signed-off-by : akshaydayma akshaydayma50@gmail.com

[steven-esser]

@akshaydayma A few questions:

1. What was the purpose of these changes? Your commit message does not explain why you made the changes you made.
2. You are missing a git commit sign off. Please rebase your commit and include this sign-off.
3. You have a few formatting errors, show in the Travis Build for this PR here: https://travis-ci.org/github/nexB/aboutcode/builds/749029147