v0.11.0

Validate no longer needs an adapter to check request scopes: the caller
says what such a scope will hold. go doc -all against 0.10.0 adds Stub
and Provided, gives Scope.Validate a variadic parameter, which every
existing call satisfies, and removes dihttp.Validate, the one breaking
change.

Added

• di.Provided[T]() makes a Stub, a key the scope resolving a Scoped
  binding will provide. s.Validate(stubs...) then makes the check that scope
  would make: what the stubs cover is satisfied, and what neither the scope
  nor the stubs provide is an error rather than Owed. Stubs apply to the
  Scoped path only; a singleton that would build a Scoped service in its
  own scope still fails there, whatever a request scope holds.

Removed

• dihttp.Validate, which opened a throwaway request scope to do what
  app.Validate(di.Provided[*http.Request]()) now does from the application
  scope, without an HTTP-shaped helper in the way. Replace the call with that
  expression and .Err().