minor symfony#19145 [Console] Reference changes that ease command testing in changelog (chalasr)

This PR was merged into the 3.2-dev branch.

Discussion
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[Console] Reference changes that ease command testing in changelog

| Q             | A
| ------------- | ---
| Branch?       | "master"
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | ~
| License       | MIT
| Doc PR        | ~

I totally forget to do it in the corresponding PRs,
I used `3.2.0` even if not yet released, hope that is correct.

Commits
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a0b4ae7 Reference changes that ease command testing in  3.2

Author: fabpot

src/Symfony/Component/Console/CHANGELOG.md

@@ -1,6 +1,13 @@
 CHANGELOG
 =========
 
+3.2.0
+------
+
+* added `setInputs()` method to CommandTester for ease testing of commands expecting inputs
+* added `setStream()` and `getStream()` methods to Input (implement StreamableInputInterface)
+* added StreamableInputInterface
+
 3.1.0
 -----