docs(security): update one-liner to use latest tag, not master (#587)

* docs(security): one-liner should use latest tag not head of master

* fix: should be sh

README.md

@@ -5,7 +5,7 @@ Create a secure Bitcoin Core node with ease.
 Run the following command in Terminal:
 
 ```sh
-/bin/sh -c "$(curl -fsSL https://github.com/bitcoin-tools/nodebuilder/raw/master/nodebuilder)"
+/bin/sh -c "$(curl -fsSL https://github.com/bitcoin-tools/nodebuilder/raw/v1.2.0/nodebuilder)"
 ```
 
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