Version 2.7.3

Because it's possible that someone could circumvent the CORS security restrictions in web browser,
made a change to allow TSA feature in web browser for more flexibility.

Version 2.7.2

Improved to support font subsetting and changed to use pdf-fontkit.

Version 2.7.1

Improved to reuse the font if it is already embedded in the PDF.

Version 2.7.0

Added support for typescript development.

Version 2.6.0

• Implemented feature of drawing text.
• Added support to place signature on multiple pages.

Fix EU signature

Merge pull request #2 from bounsel/main

Fix EU signature. Thanks marsanla!

Supported enabling LTV

Supported to enable Long-Term Validation.

Support adding a document timestamp

Support adding a document timestamp from a specified TSA

Support adding a new signature to a signed pdf

Support adding a new signature to a signed pdf by using incremental update.

Supported to DocMDP

Added support of DocMDP and improved the way of appending TSA timestamp.
Now the way of appending TSA timestamp to the signature is without using unauthenticated attributes of pkcs#7, so the edited version of node-forge is no more necessary.