v0 9 40

[lainio]

• new test for out.Handle
• documentation for the asserter constants
• go documentation update
• new bench rule
• new samles to test certain features
• 3x faster deferred err handlers!!
• all error handlers: func(err error) error
• snippets for new error handler signature
• new error handler signature docs & handler helpers: Noop,..
• Logf works without argument
• guides started for signature change
• Decamel separates pkg name with colon
• func(error) error: is a new handler signature
• migration readme for Handle/Catch signature change
• new err2.Handle API called when err == nil, experimental!
• reference benchmark to compare how well our err2.Handle is optimized
• performance boost explanation
• add test/example for Catch fmt & bug fix
• automigration quide
• informative RED runtime error message when type error detected
• added documentation to Result structs
• Decamel alloc optimization
• migration README
• finalizing v0.9.40