support feature flag (#143)

* support feature flag

* increment version

Co-authored-by: katien <[email protected]>

Added a hasOnActiveWalletChanged method. This is passed to the widget…

…, and used for polling optimizations. (#139)

Co-authored-by: Miki Stanger <[email protected]>

Merge branch 'master' of github.com:portis-project/web-sdk

Merging develop to master (#125)

* Bugfix/claim voucher should pass sdk config (#122)

* pass SDK config

* bump version

* package.lock update

* updated return type and bump version to 4.0.4 (#124)

Bugfix/claim voucher should pass sdk config (#122) (#123)

* pass SDK config

* bump version

* package.lock update

added missing functions lost in merge (#121)