docs(README): fix contribution guide link
docs(README): fix contribution guide link
TypeStrong/typedoc,PolymerLabs/typedoc,sebastian-lenz/typedoc,PolymerLabs/typedoc,sebastian-lenz/typedoc,sebastian-lenz/typedoc,TypeStrong/typedoc,TypeStrong/typedoc,PolymerLabs/typedoc