Extensions were added twice
Updated changelog
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Adds twig lexerOptions to ViewRendererTest to demonstrate error
Fixes Twig lexerOptions throwing exception (#3877) and adds test for lexerOptions
SluggableBehavior initial implementation
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Merge remote-tracking branch 'origin/zh-CN-translation-02' into zh-CN-translation-02

Conflicts:
	docs/guide-zh-CN/concept-di-container.md
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Merge pull request #3916 from riverlet/zh-CN-translation-02

Zh cn translation 02
Brazilian Portuguese translation of start-installation.md and start-workflow.md
Merge branch 'master' of git://github.com/yiisoft/yii2 into start-installation-start-workflow-pt-br
Fix syntax
`BaseMigrateController` extracted
Update intro-upgrade-from-v1.md
Update intro-yii.md
`MigrationInterface` extracted
Issue #3801 added to CHANGELOG