collection 这个方法哪来了，视频中没看到

Your requirements could not be resolved to an installable set of packages.

Problem 1

• Conclusion: don't install tymon/jwt-auth 0.5.10

• Conclusion: don't install tymon/jwt-auth 0.5.9

• Conclusion: don't install tymon/jwt-auth 0.5.8

• Conclusion: don't install tymon/jwt-auth 0.5.7

• Conclusion: don't install tymon/jwt-auth 0.5.6

• Conclusion: don't install tymon/jwt-auth 0.5.5

• Conclusion: don't install tymon/jwt-auth 0.5.4

• Conclusion: don't install tymon/jwt-auth 0.5.3

• Conclusion: don't install tymon/jwt-auth 0.5.2

• Conclusion: don't install tymon/jwt-auth 0.5.1

• Conclusion: remove namshi/jose 7.2.3

• Installation request for tymon/jwt-auth 0.5.* -> satisfiable by tymon/jwt-auth[0.5.0, 0.5.1, 0.5.10, 0.5.2, 0.5.3, 0.5.4, 0.5.5, 0.5.6, 0.5.7, 0.5.8, 0.5.9].

• Conclusion: don't install namshi/jose 7.2.3

• tymon/jwt-auth 0.5.0 requires namshi/jose 2.0.* -> satisfiable by namshi/jose[2.0.0, 2.0.1, 2.0.2, 2.0.3].

• Can only install one of: namshi/jose[2.0.0, 7.2.3].

• Can only install one of: namshi/jose[2.0.1, 7.2.3].

• Can only install one of: namshi/jose[2.0.2, 7.2.3].

• Can only install one of: namshi/jose[2.0.3, 7.2.3].

• Installation request for namshi/jose (locked at 7.2.3) -> satisfiable by namshi/jose[7.2.3].

Installation failed, reverting ./composer.json to its original content.

这种问题，不知道是什么引起的？

群主 "tymon/jwt-auth": "1.0.0-beta.2" 这个版本同你所讲的版本有什么区别

public function getAuthPassword() {
}
为什么只有一个修改密码的字段，没有修改用户名（email)的。另外，这个方法什么位置调用？？？

return $this->item($lesson, new LessonTransformer())
这一步，它的具体意义是什么？ 这里没看明白

"tymon/jwt-auth": "1.0.0-beta.2"
这个版本同群主所说的版本具体会有些什么区别