minor symfony#21182 [Workflow] Removed twig from composer.json (dev section, not used) (lyrixx)

This PR was merged into the 3.2 branch.

Discussion
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[Workflow] Removed twig from composer.json (dev section, not used)

| Q             | A
| ------------- | ---
| Branch?       | 3.2
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#21172
| License       | MIT
| Doc PR        | -

Commits
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4a81af6 [Workflow] Removed twig from composer.json (dev section, not used)

Author: fabpot

src/Symfony/Component/Workflow/composer.json

@@ -25,8 +25,7 @@
     },
     "require-dev": {
         "psr/log": "~1.0",
-        "symfony/event-dispatcher": "~2.1|~3.0",
-        "twig/twig": "~1.14"
+        "symfony/event-dispatcher": "~2.1|~3.0"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\Workflow\\": "" }