Update i_u_m_install.md

The URL of Docker Install has been changed from https://docs.docker.com/engine/installation/linux/ to https://docs.docker.com/install/

I think this is their way of putting all possible means to install Docker in one URL. 
Although the old link redirects pretty neatly, I feel it's best the URL is updated to reflect the new one to avoid a broken link later on.
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Promise Akpan 2019-06-09 15:50:20 +01:00 • committet von GitHub
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@ -4,7 +4,7 @@
You need Docker and Docker Compose.
**1\.** Learn how to install [Docker](https://docs.docker.com/engine/installation/linux/) and [Docker Compose](https://docs.docker.com/compose/install/).
**1\.** Learn how to install [Docker](https://docs.docker.com/install/) and [Docker Compose](https://docs.docker.com/compose/install/).
Quick installation for most operation systems: