Remove submodule step from README

Since the bootstrap does it now
Centril · Jan 11, 2019 · 27989ec · 27989ec
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commit 27989ec
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diff --git a/README.md b/README.md
@@ -38,7 +38,6 @@ Read ["Installation"] from [The Book].
 3. Build and install:
 
     ```sh
-    $ git submodule update --init --recursive --progress
     $ ./x.py build && sudo ./x.py install
     ```