Add deprecation notice to readme

Add unmaintained banner

Add unmaintained header

Merge pull request #247 from noritada/typo-fix

Remove characters which seem to have been accidentally inserted

Merge pull request #206 from dlqs/master

Merge pull request #225 from gdetrez/patch-1

Merge pull request #228 from brettcannon/patch-1

Merge pull request #230 from brettcannon/patch-2

Merge pull request #245 from DrupFlip/patch-1

Corrected a typo

Update factorial example from using get_local to local.get

Drop Greenkeeper mention

Update link to cranelift source code

make clearer where to add web-sys as dependency