chore(readme): specify the sweetalert2 version

by default it'll install the latest major, which isn't supported yet
sweetalert2 · Jan 28, 2019 · 504d149 · 504d149
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commit 504d149
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -21,7 +21,7 @@ The following options can be React elements:
 ## Installation
 
 ```bash
-npm install --save sweetalert2 sweetalert2-react-content
+npm install --save sweetalert2@^7.18.0 sweetalert2-react-content
 ```
 
 ## Usage Example