title: how to make UIView with equal width and height with SnapKit in Swift?
body: <p>I want to make a UIView rectangular with SnapKit in Swift, like this</p>
  
  <pre><code>lazy var customView: UIView = {
          let view = UIView(frame: CGRect())
          self.addSubview(view)
          view.snp.makeConstraints({ (make) in
              make.left.top.bottom.equalToSuperview().inset(self.inset)
              make.width.equalTo(make.height)  // Error in this line
          })
          return view
      }()
  </code></pre>