Use the Picnic OSS Maven Parent

[Stephan202]

While there:

• Fix the build by dropping Oracle JDK 8.
• Apply some improvements to the README.
• Upgrade various dependencies.

[ghost]

DeepCode Report (#5bf584)

DeepCode analyzed this pull request. There are no new issues.

[coveralls]

Pull Request Test Coverage Report for Build 430

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.806%

---

Totals
Change from base Build 400:	0.0%
Covered Lines:	125
Relevant Lines:	144

---

💛 - Coveralls

[sandermak]

Branch builds fine for me locally, did see some checksum validation warnings though (Maven):

[WARNING] Checksum validation failed, expected bd4d05e97ec9dc0a5494412055df8f36bc8dbc27 but is 9eaf096e9f2b4ed7d5f866b09b5121f6eb85963a from picnic for https://nexus.global.picnicinternational.com/repository/maven-public/com/fasterxml/jackson/core/jackson-annotations/2.10.0/jackson-annotations-2.10.0.pom
[WARNING] Could not validate integrity of download from https://nexus.global.picnicinternational.com/repository/maven-public/com/fasterxml/jackson/core/jackson-annotations/2.10.0/jackson-annotations-2.10.0.pom: Checksum validation failed, expected bd4d05e97ec9dc0a5494412055df8f36bc8dbc27 but is 9eaf096e9f2b4ed7d5f866b09b5121f6eb85963a
[WARNING] Checksum validation failed, expected bd4d05e97ec9dc0a5494412055df8f36bc8dbc27 but is 9eaf096e9f2b4ed7d5f866b09b5121f6eb85963a from picnic for https://nexus.global.picnicinternational.com/repository/maven-public/com/fasterxml/jackson/core/jackson-annotations/2.10.0/jackson-annotations-2.10.0.pom

For the rest LGTM!

[Stephan202]

Tnx for checking! Feel free to tick approve. :)

The checksum warnings are not in the Travis CI logs, so they're probably particular to our Nexus instance; I'll try to see whether flushing the caches helps.

[Stephan202]

Hmm, turns out the issue is not with our Nexus deployment, but upstream after all. I filed MVNCENTRAL-5225.