Update README.

Bump version 0.4.0. Hello 2020.

Squashed commit of the following:

commit ad28a3c
Author: huxuan <[email protected]>
Date:   Thu Apr 16 11:53:31 2020 +0800

    Update example.

commit 97dc377
Author: huxuan <[email protected]>
Date:   Thu Apr 16 11:52:52 2020 +0800

    Add .DS_Store to .gitignore.

commit 6cc2803
Author: huxuan <[email protected]>
Date:   Thu Apr 16 11:36:32 2020 +0800

    Update resumecls.

commit 1f62ed7
Author: huxuan <[email protected]>
Date:   Thu Apr 16 10:15:11 2020 +0800

    Update README.

commit d6a30f9
Author: huxuan <[email protected]>
Date:   Thu Apr 16 10:13:16 2020 +0800

    Add *.pdf in .gitignore.

commit 1533392
Author: huxuan <[email protected]>
Date:   Thu Apr 16 10:12:52 2020 +0800

    Update README.

commit 69598db
Author: huxuan <[email protected]>
Date:   Wed Apr 15 22:25:59 2020 +0800

    Update README.

commit 3b4a2be
Author: huxuan <[email protected]>
Date:   Wed Apr 15 22:22:39 2020 +0800

    Update README.

commit c14ab0f
Author: huxuan <[email protected]>
Date:   Wed Apr 15 22:22:13 2020 +0800

    Update Makefile.

Update the example.

Merge pull request #4 from idear1203/master

Remove redundant `adobefonts` parameter. Thanks @idear1203.

Update example module.

Version o.2.1

Version 0.2

Version 0.1.4: Use bfseries for better English support

Version 0.1.3: Add reference settings

Version 0.1.2: Customization part in documentation