title: Glide cannot resolve method 'signature(StringSignature)'
body: <p>I am using glide 4.3.1</p>
  
  <p>I want to call signature method but does't appears.</p>
  
  <p>my code</p>
  
  <pre><code>Glide.with(context).load(context.getFilesDir().getPath() + "/" + imgName).into(imgView);
  </code></pre>
  
  <p>I want to do this</p>
  
  <pre><code>Glide.with(context).load(context.getFilesDir().getPath() + "/" + imgName).signature(new StringSignature("someVersion")).into(imgView);
  </code></pre>
  
  <p>I'm using android studio, when i put mouse over signature method i see the message: Cannot resolve method 'signature(StringSignature)'.</p>
  
  <p>My build gradle:</p>
  
  <pre><code>dependencies {
    compile 'com.github.bumptech.glide:glide:4.3.1'
  }
  </code></pre>