Log Message:
Update to 0.8.0

Changelog:
0.8.0:
What's new since version 0.7.1

errors 0.8.0 decomposes Wrap (and Wrapf) into their component operations, namely \ 
adding a message to an error, and adding a stack trace to an error, which were \ 
previously merged into a single operation.

This is accomplished by adding two top level functions, errors.WithMessage and \ 
errors.WithStack, and rewriting Wrap and Wrapf in terms of these operations.

The motivation for this change was need to treat each of the following \ 
operations as distinct:

    Adding a context message to an existing error without altering the stack trace.
    Adding a stack trace to an existing error without the requirement of adding \ 
an additional message.
    Retrieving the immediate cause of an error; popping one element of the error \ 
stack.

The addition of WithStack and WithMessage increases the surface area of this \ 
package by two methods, after long discussions at GopherCon 2016 it was felt \ 
strongly that destructuring the operation of Wrap and Wrapf was necessary.

For the moment Wrap and Wrapf remain, but depending on your feedback may be \ 
deprecated in future releases. Please leave comments via the issue link.

Thanks to @nmiyake and @fabstu for their assistance in preparing this release.
Bug fixes

    Add Go 1.7.1 to .travis.yml. Thanks @Thomasdezeeuw

0.7.1:
What's new since version 0.7.0

0.7.1 is a minor release in the 0.7 series which contains bugfixes, \ 
documentation improvements and cleanups and some internal refactoring.
Improvements

    Rename StackTrace interface to stacktracer in docs and examples.
    Capitalise first letter of trace in examples. Thanks @jongillham
    Wrapped errors now print full stacktrace.
    Documentation improvements, #69. Thanks @AlekSi
    Added benchmarks comparing stack trace performance. Fixes #72. Thanks @kardianos

Bug fixes

    Fix %q format for wrapped errors. Thanks @greensnark
    Remove trailing newline from LICENSE file. Thanks @vbatts
    Tests now pass when pkg/errors is vendored. Fixes #77. Thanks @exp
    Fix the %q format for errors so it puts "" around the output \ 
(caused by a bug introduced between 0.7.0 and 0.7.1). Thanks @ncw

0.7.0:
What's new since version 0.6.0

0.7.0 removes the deprecated errors.Location and errors.Stack interfaces, and \ 
the errors.Fprint helper. Types returned from this package now implement the \ 
fmt.Formatter interface and can print themselves when passed to fmt.Printf and \ 
friends.

For example:

    fmt.Printf("%s\n", err) will print the message of the error as per \ 
normal, recursive if the underlying error has a Cause method.
    fmt.Printf(%v\n", err) operates the same as %s.
    fmt.Printf(%+v\n", err) prints the error message as above, then prints \ 
a stack trace of the point that the error was created with errors.New, \ 
errors.Errorf, etc.

This new behaviour is described in this blog post.

Other changes in 0.7.0 include:

    The Stacktrace() []Frame interface method was renamed to StackTrace() \ 
StackTrace. Please note the change in capitalisation. The previous interface was \ 
added in 0.6.0 so hopefully this change will not cause to many breaking changes. \ 
The name and signature of the method is not expected to change again in the \ 
future. Fixes #50.

Bug fixes

    README.md incorrectly reported the licence of this package as MIT, not BSD 2 \ 
clause, this has been rectified. Thanks @anthonyfok. Fixes #41.