googletest

Removing tiny-dnn from "Who is using.."

The tiny-dnn project has changed the test framework (https://github.com/tiny-dnn/tiny-dnn/commit/d0d35ca2f4e75b3f647787e19ee7f31d0784b398) and removed the googletest usage.

Removing it from the "Who is Using Google Test?" list so as to keep it accurate.