ci,lib.sh: print Github API rate limits
ci,lib.sh: print Github API rate limits

Some of Travis-CI integration uses quite a few Github API calls.
It's useful to print them to better understand what's happening, when
things are not happening as expected.

Signed-off-by: Alexandru Ardelean <685557f6b7c225d86b536740313ed51b24843a58@analog.com>

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