Support sending custom StackTraces

• Adds the method CreateErrorWithStackTrace(message string, st StackTrace) for sending custom raygun4go.StackTraces. This can be useful when the default system stack trace is not relevant or sufficient. Thanks @ramizpolic for prompting the feature!

Set up go modules

Sets up go modules so go-errors, uuid and GoConvey are not propagated as indirect dependencies.

Fix support for go-errors

• The stack trace parsing logic was stripping the first line of the stack trace string which causes stack traces from go-errors to appear in Raygun very incorrectly. This bug has been fixed by iterating the stack trace model of a go-errors Error and getting the values from there rather than serializing the stacktrace as a string and then parsing it. Credit to @IcaroG for identifying and fixing this.

Manually send crash reports

• The Submit method on the Client has been exposed, allowing you to create and send your own PostData crash reporting payloads to Raygun. - Thanks to douglas-soares

Initial release

After having a beta version number for a while, we've now moved this to version 1.0.

This release adds the custom-grouping-key feature to match our other Raygun providers.

A couple of stack trace parsing bug fixes have also been made.