Add a warning message for times when the Preact Devtools catches a Component which does not implement the Preact.Component class. (#572)
Add a warning message for times when the Preact Devtools catches a Component which does not implement the Preact.Component class. (#572)

Guard against invalid Components causing the devtools to throw ReferenceError when accessing component.forceUpdate or component.setState.
neeharv/preact,developit/preact,neeharv/preact,developit/preact