Added tokei.rs badge (#253)

[![lines of code](https://tokei.rs/b1/github/databrickslabs/dbldatagen)]([https://codecov.io/github/databrickslabs/dbldatagen](https://github.com/databrickslabs/dbldatagen))

Author: nfx

README.md

@@ -12,6 +12,7 @@
 [![PyPi package](https://img.shields.io/pypi/v/dbldatagen?color=green)](https://pypi.org/project/dbldatagen/)
 [![codecov](https://codecov.io/gh/databrickslabs/dbldatagen/branch/master/graph/badge.svg)](https://codecov.io/gh/databrickslabs/dbldatagen)
 [![PyPi downloads](https://img.shields.io/pypi/dm/dbldatagen?label=PyPi%20Downloads)](https://pypistats.org/packages/dbldatagen)
+[![lines of code](https://tokei.rs/b1/github/databrickslabs/dbldatagen)]([https://codecov.io/github/databrickslabs/dbldatagen](https://github.com/databrickslabs/dbldatagen))
 
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