Revert "Add errors.AsError() to get back that behaviour"

This reverts commit 11b3e1b.

Author: ConradIrwin

README.md

@@ -66,13 +66,4 @@ everyone can benefit.
 This package is licensed under the MIT license, see LICENSE.MIT for details.
 
 ## Changelog
-* v1.1.0 updated to use go1.13's standard-library errors.Is method instead of == in errors.Is
-* v1.2.0 added `errors.As` from the standard library.
-* v1.3.0 *BREAKING* updated error methods to return `error` instead of `*Error`.
->  Code that needs access to the underlying `*Error` can use the new errors.AsError(e)
-> ```
->   // before
->   errors.New(err).ErrorStack()
->   // after
->.  errors.AsError(errors.Wrap(err)).ErrorStack()
-> ```
+* v1.1.0 updated to use go1.13's standard-library errors.Is method instead of == in errors.Is

error.go

@@ -207,10 +207,3 @@ func (err *Error) TypeName() string {
 func (err *Error) Unwrap() error {
 	return err.Err
 }
-
-// AsError converts e to an *errors.Error.
-// If e does not already have a stacktrace attached, the current stack
-// will be added.
-func AsError(e error) *Error {
-	return Wrap(e, 1).(*Error)
-}