advice on upgrading from 1.x to 2.x.

 *  Fix: Don't leak connections! There was a regression in 2.0.0-RC1 where
    connections were neither closed nor pooled.
 *  Fix: Revert builder-style return types from OkHttpClient's timeout methods
    for binary compatibility with OkHttp 1.x.
 *  Fix: Don't skip client stream 1 on SPDY/3.1. This fixes SPDY connectivity to

- Select a Java 11 VM as "Gradle JVM"
- In the "File already exists" dialogue, choose "Yes" to overwrite
- In the "Open Project" dialogue, choose "Delete Existing Project and Import"
- Revert the Git changes to files in the `.idea` folder

NOTE: Due to the project size, the very first import can take a while and IntelliJ might become unresponsive for several seconds during this period.