Add pypi to travis-ci providers for python bindings. Only the first x86 Linux build will push to pypi on tagged commits.
Add pypi to travis-ci providers for python bindings. Only the first x86
Linux build will push to pypi on tagged commits.

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

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