Display HTTP error response to the user

[hiddewie]

Fixes #91

This PR logs the (error) response body in the Exception thrown by the plugin whenever a HTTP response fails. This allows the user to fix the problem indicated by the Nexus server.

[szpak]

Thanks @hiddewie . Spotless has some formal objections, but in general it LGTM.

[CRogers]

Fantastic - I was about to make my own PR as we're facing the same issue:

java.lang.RuntimeException: Failed to release staging repository, server at https://oss.sonatype.org/service/local/ responded with status code 500, body: io.github.gradlenexus.publishplugin.shadow.okhttp3.ResponseBody$1@7a0c0fab

[hiddewie]

Ah yes I messed up the indenting, hopefully fixed.

[szpak]

Running ./gradlew spotlessKotlinCheck sometimes might be faster ;-).

[szpak]

Thanks again. It will be part of the 1.1.0 release.

[hiddewie]

Thanks for the help and the quick feedback!