Update installation documentation

Remove mention of Git submodules since we no longer use them in the documentation.
RauliL · Jan 8, 2019 · a50fe83 · a50fe83
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commit a50fe83
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diff --git a/docs/installation.md b/docs/installation.md
@@ -15,13 +15,6 @@ by executing the following command:
 $ git clone https://github.com/RauliL/plorth.git
 ```
 
-If you are planning on using the command line interface, you will also need to
-execute the following command to pull in external dependencies used by it:
-
-```bash
-$ git submodule update --init
-```
-
 ## Compiling
 
 After you have cloned the source code from GitHub, you need to compile the