Integrates sbt-org-policies Plugin

[juanpedromoreno]

Fixes https://github.com/47deg/case-classy/issues/54, Fixes https://github.com/47deg/case-classy/issues/37 Fixes https://github.com/47deg/case-classy/issues/46

This PR releases a new version under com.47deg group id and provides:

File Headers

Activates by default headers for all files. It'll keep up to date the headers of all files based on org license, project start year, project name and project organisation.

Policy files

On every merge in master, the plugin will keep up to date some policy files like AUTHORS.md, README.md (badges, license notice, etc.), CONTRIBUTING.md, LICENSE, ...

In the same way, the file located at modules/readme/src/main/tut/README.md will be compiled by tut and copied automatically to the root folder, and also will be commited automatically. Hence, nobody should care about the README file in the root folder.

Releases

On every merge in master, if the version in the version.sbt is an snapshot version, the plugin will publish the snapshot as usual. If you want to release a new version, just change the version.sbt with a final version (removing the -SNAPSHOT suffix) and the plugin will:

• Publish the final version to Maven central, sonatype, etc.
• Update the CHANGELOG.md file with all the PRs that are part of the release (from now on, the PR title is important to give information).
• Create the github tag/release with the same information as in the CHANGELOG file.
• Set the next snapshot version.
• Update the microsite: The plugin will publish the microsite with the updated docs. Also, it'll update all case-classy versions across all the doc (markdown) files.

Please @raulraja @andyscott have a look. Thanks.

[codecov-io]

Codecov Report

Merging #59 into master will decrease coverage by 16.35%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #59       +/-   ##
==========================================
- Coverage   82.15%   65.8%   -16.36%     
==========================================
  Files          17      16        -1     
  Lines         426     424        -2     
  Branches       13       9        -4     
==========================================
- Hits          350     279       -71     
- Misses         76     145       +69

Impacted Files	Coverage Δ
...c/main/scala/classy/generic/derive/MkDecoder.scala	52.08% <ø> (-37.51%)	:arrow_down:
...dules/core/src/main/scala/classy/wheel/types.scala	66.66% <ø> (-6.67%)	:arrow_down:
modules/core/src/main/scala/classy/Read.scala	57.14% <ø> (-21.43%)	:arrow_down:
...s/generic/src/main/scala/classy/generic/auto.scala	100% <ø> (ø)	:arrow_up:
...eneric/src/main/scala/classy/generic/package.scala	0% <ø> (-100%)	:arrow_down:
modules/core/src/main/scala/classy/stringMap.scala	0% <ø> (-55.56%)	:arrow_down:
...n/scala/classy/generic/derive/StringSplitter.scala	100% <ø> (ø)	:arrow_up:
...ala/classy/DefaultReinterpretStringInstances.scala	100% <ø> (ø)	:arrow_up:
modules/core/src/main/scala/classy/decoders.scala	43.1% <ø> (-3.45%)	:arrow_down:
...ore/src/main/scala/classy/DecodeErrorPrinter.scala	0% <ø> (-76.75%)	:arrow_down:
... and 14 more

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[andyscott]

LGTM