make changed libdef message welcoming to contribute changes back (#1613)
make changed libdef message welcoming to contribute changes back (#1613)

* make changed libdef message welcoming to contribute changes back

* fix typo

mwalkerwells/flow-typed,doberkofler/flow-typed,orlandoc01/flow-typed,splodingsocks/FlowTyped,mwalkerwells/flow-typed,flowtype/flow-typed,flowtype/flow-typed,doberkofler/flow-typed,splodingsocks/FlowTyped,orlandoc01/flow-typed