title: Cannot fin 'InstanceID' and 'InstanceIDTokenHandler' on swift project after updated Firebase
body: <p>I'm with an old project that needed to update Firebase, so I did.
  After that, I get two errors and I can't understand how to solve them. Could anyone help me with this, please?</p>
  <p>File1.swift:</p>
  <pre><code>func token(withAuthorizedEntity authorizedEntity: String, scope: String, options: [AnyHashable: Any]? = nil, handler: @escaping InstanceIDTokenHandler) {
      
  }
  </code></pre>
  <p>error: Cannot find type 'InstanceIDTokenHandler' in scope</p>
  <p>File2.swift</p>
  <pre><code>func checkDeviceToken() {
      let hasDeviceToken: Bool      =  self.devicesTokenUseCase.hasDeviceToken()
      let dontHaveDeviceToken: Bool = !hasDeviceToken
  
      InstanceID.instanceID().instanceID { (result, _) in
          if let result = result {
              let isNotSameToken: Bool = !self.devicesTokenUseCase.isSameDeviceToken(deviceToken: result.token)
  
              if hasDeviceToken &amp;&amp; isNotSameToken {
                  self.updateDeviceToken(token: result.token)
              } else if dontHaveDeviceToken {
                  self.sendDeviceToken(token: result.token)
              }
          } else {
              self.checkDeviceToken()
          }
      }
  }
  </code></pre>
  <p>error: Cannot find 'InstanceID' in scope</p>