Hotfix - typo - Expressive 3.0 dev

[michalbundyra]

• Added missing closing bracket
• Fixed Expressive target on create project: should be 3.0.x-dev instead of 3.0.0-dev, when I tried:

  $ composer create-project "zendframework/zend-expressive-skeleton:3.0.0-dev" expressive-3.0-dev

  I've got:

  [InvalidArgumentException]                                                             
  Could not find package zendframework/zend-expressive-skeleton with version 3.0.0-dev.  

/cc @ezimuel @weierophinney