Tag integrated version in Pharo

[jecisc]

I think we agreed on tagging the versions integrated in Pharo.

I am doing an integration now.

Commit: 3fef319

Changelog since previous integration:

# Commander 2 integration of the 13 of September 2019

## Features 

* Add `#register:after:` and `#register:before:`. ([ad5041c](https://github.com/pharo-spec/Commander2/commit/ad5041cccdd34a7b021ca505323ce6d9a5912480))
* Implemented part of the missing API and implemented corresponding tests. ([5c91fac](https://github.com/pharo-spec/Commander2/commit/5c91facd019e952b993750725bd187f2346db6d9))

## Bug fixes

* Added missing deprecation methods to make transition from v1 to v2 smoother. ([3fef319](https://github.com/pharo-spec/Commander2/commit/3fef31976b6daa4aeef0dcab9f3fcde6a860a484))
* Changed string returned by #defaultDescription to be 'Not described command.' ([71ad574](https://github.com/pharo-spec/Commander2/commit/71ad574eb3af5a88ba2aca47b45f8e7caffc0192))


## Cleanings 

* Preparing for major release, removing deprecated methods we do not want in next major version: - #canBeRun - #canBeRunBlock - #canBeRunBlock: - #defaultCommandName - #runWith: ([3dbd6b1](https://github.com/pharo-spec/Commander2/commit/3dbd6b184d76d1cdd94683b7dc611d5aa531103e))
* Updated baseline to be more flexible. - Do not provide migrator in default group. - Provide core,test and migrator groups. ([7a7491b](https://github.com/pharo-spec/Commander2/commit/7a7491b8ed4a6925d836922e0b84d683caa4799e))
* Enhanced comment. ([8379fb3](https://github.com/pharo-spec/Commander2/commit/8379fb34a40826e8b3681bf2ede30696a656b9f8))
* Did migration with the following renamings (order is important): #name -> #dynamicName. #description -> #dynamicDescription. #basicName -> #name. #basicDescription -> #description. ([1a8f4e8](https://github.com/pharo-spec/Commander2/commit/1a8f4e8a1b7da5bdcc44c2a1d952557a71b6f351))
* wrap environment into RBNamespace. ([723cddd](https://github.com/pharo-spec/Commander2/commit/723cdddb42780305a6366660d0fc40ad8bec6623))
* Put #runWith: in deprecations package. ([cc9025d](https://github.com/pharo-spec/Commander2/commit/cc9025d89b168ba2159b4db610ff00c2dff707f8))
* Removed #runWith: ([c78dd09](https://github.com/pharo-spec/Commander2/commit/c78dd0977727ad2dc103c36ac326d18520f247e4))
* Renamed #defaultCommandName as #defaultName. Used deprecation. ([c1bad44](https://github.com/pharo-spec/Commander2/commit/c1bad4407a55e654b0183005c885289177dc0b04))
* Renamed #canBeRunBlock as #canBeExecutedBlock via a deprecation. ([5a87a11](https://github.com/pharo-spec/Commander2/commit/5a87a1185e071990dd2c684444e7931faa25b67d))
* Moved spec related methods in class-side of CmCommandGroup to spec package. ([4ae2f84](https://github.com/pharo-spec/Commander2/commit/4ae2f8478b2b59d9051bdb1a65ca2b4a0d8eee18))
* Moved spec-specific methods on class side of CmCommand to Spec integration package. ([11d7997](https://github.com/pharo-spec/Commander2/commit/11d799799ec055d5113ccf589f42cf58822ab322))
* Renamed #canBeRun as #canBeExecuted to be more consistent. Created a deprecation to ease migration of users. ([152e6a7](https://github.com/pharo-spec/Commander2/commit/152e6a72261a8f1f6fb4e9ad579a199b73dba036))
* Reclassified all #canBeRun methods in 'testing' protocol. ([813cda2](https://github.com/pharo-spec/Commander2/commit/813cda255f8a0cc6df592bbe22d5f26850fbcb31))
* Reclassified #execute methods in 'executing' protocol. Brings consistence and solves issue #9 ([19c1ee0](https://github.com/pharo-spec/Commander2/commit/19c1ee0db83830abe3ee68ea0a11581765e90df6))
* Renaming of CmCommandGroupTest to CmCommandsGroupTest. ([5f20942](https://github.com/pharo-spec/Commander2/commit/5f20942c03cbb529b285883d9d1c9db2c870c942))
* Renamed test class to match class under test. ([8ab2c3b](https://github.com/pharo-spec/Commander2/commit/8ab2c3bb15b664b2cfa46ade33d1e4d656f40741))

[juliendelplanque]

This version is a release: v2.0.1 I will add it to the release note.

[juliendelplanque]

I updated the release note with your content. Thanks!