[Tests] Move a HTTP Stub json file to correct path

Signed-off-by: Miguel M. Almeida <miguelcma@gmail.com>
[Podfile] Lock OHHTTPStubs version to 3.1.2

Signed-off-by: Miguel M. Almeida <miguelcma@gmail.com>
[Release] New Liquid release: v0.8.0-beta

Signed-off-by: Miguel M. Almeida <miguelcma@gmail.com>