title: different kotlin versions in android project
body: <p>I can't figure out what problem I can get if I have different Kotlin versions in the project and in the dependencies of that project.</p>
  <p>Option 1:</p>
  <ul>
  <li>the project include Kotlin <code>1.3.72</code></li>
  <li>some libraries (<code>okhttp</code> for example) include Kotlin <code>1.4.10</code>. (<em>We now use Kotlin 1.4.x functional interfaces for Authenticator, Interceptor, and others.</em>)</li>
  </ul>
  <p>Option 2:</p>
  <ul>
  <li>the project include Kotlin <code>1.4.0</code></li>
  <li>some libraries include Kotlin <code>1.3.71</code></li>
  </ul>
  <p>In option 2 I get next warning:<br />
  w: Runtime JAR files in the classpath should have the same version. These files were found in the classpath:
  /.gradle/caches/transforms-2/files-2.1/ab41544fa06f7b55dec847efe3b9899c/jetified-kotlin-stdlib-jdk7-1.3.71.jar (version 1.3)
  .gradle/caches/transforms-2/files-2.1/a4c6c3b949eb40b555dea1468ae75f87/jetified-kotlin-stdlib-1.4.10.jar (version 1.4)
  .gradle/caches/transforms-2/files-2.1/f98f62bf33e752598311020043618780/jetified-kotlin-stdlib-common-1.4.10.jar (version 1.4)<br />
  w: Some runtime JAR files in the classpath have an incompatible version. Consider removing them from the classpath</p>