Add dependencies/vendor (whatsapp)

vendor/modernc.org/sqlite/README.md

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+# sqlite
+
+Package sqlite is a CGo-free port of SQLite.
+
+SQLite is an in-process implementation of a self-contained, serverless,
+zero-configuration, transactional SQL database engine.
+
+Installation
+
+    $ go get modernc.org/sqlite
+
+Documentation: [godoc.org/modernc.org/sqlite](http://godoc.org/modernc.org/sqlite)
+
+Builders: [modern-c.appspot.com/-/builder/?importpath=modernc.org%2fsqlite](https://modern-c.appspot.com/-/builder/?importpath=modernc.org%2fsqlite)