Merge pull request timber#1509 from timber/docs/contributing

Deprecate contributing guidelines in wiki, only use CONTRIBUTING.md

Fixed spelling error in changelog

Merge pull request timber#1457 from matteodem/patch-1

Remove dead code from test-timber-loader

Update changelog and version numbers

Update changelog and version numbers

Update changelog

Merge pull request timber#1395 from gchtr/1387/deprecate-function_wra…

…pper

1387/Deprecate function_wrapper helper and introduce warning

Merge pull request timber#1383 from mgussekloo/patch-1

Process ToJPG only if the filetype is supported

Update ISSUE_TEMPLATE.md

Update changelog and version numbers