CHANGELOG.md, README.md: release 3.0.0

CHANGELOG.md

 
 `should` adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## 3.0.0 (2020-07-10)
+- (API change) Directives should be placed before any command #45
+- (API change) --retry launches only failed tests !21
+- (new) option --retry-warned to retry both failed and warned tests !21
+- (new) 'j' tests, testing json data #51
+- Code refactor #39
+- Improved regular and verbose output #38
+- Updated and improved documentation
+
 ## 2.0.0 (2019-04-01)
 - (API change) Commands and tests can be interleaved, each test flushing the command outputs #36
 - (API change) Passing 'f' tests now trigger a fail (TODO-but-ok) #20

README.md

@@ -20,7 +20,7 @@ and is intended to work on any command-line application
 
 ### Download
 
-The archive [should-2.0.0.tar.gz](https://gitlab.bioinfo-diag.fr/vidjil/should/-/archive/2.0.0/should-2.0.0.tar.gz)
+The archive [should-3.0.0.tar.gz](https://gitlab.bioinfo-diag.fr/vidjil/should/-/archive/3.0.0/should-3.0.0.tar.gz)
 also includes this documentation with demo files.
 In your projetcts, you only need the [should.py](https://gitlab.bioinfo-diag.fr/vidjil/should/raw/master/src/should.py) file.