Fixing req.query support

Changes:

• If a req.query object is present, we just take it as the value for queryStringParameters, otherwise we parse the query string from the given URL value.

Documentation update

Changes:

• Fixing supported response formats documentation.
• General documentation update.

Minor documentation update

Changes:

• Fixing typo in documentation source code example.
• Adding linting check on CI.

Documentation update

Changes:

• Updating module introduction.
• Adding Donate / Support section.

More compatible!!!

Added:

• Increase support for multiple lambda implementation formats.
• Improved error handling.
• All AWS.Lambda constructor options are now supported.

Many thanks to @zvictor for supporting this release!!!