Fix tag requirement on pypi travis-ci
Fix tag requirement on pypi travis-ci

This should fix the deploy stage on the travis-ci builds caused by an
invalid yaml config.

Signed-off-by: Travis F. Collins <85b3090024574187adc8ed76279a4ab31e75e8d8@analog.com>

analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio