Add a condition to travis to skip the CI when only docs changes are made
Add a condition to travis to skip the CI when only docs changes are made

artyom-razinov/EarlGrey,sskhandp/EarlGrey,artyom-razinov/EarlGrey,sskhandp/EarlGrey,google/EarlGrey,sskhandp/EarlGrey,saurabhj80/EarlGrey,saurabhj80/EarlGrey,saurabhj80/EarlGrey,artyom-razinov/EarlGrey,sskhandp/EarlGrey,ed-chin/EarlGrey,ed-chin/EarlGrey,ed-chin/EarlGrey,google/EarlGrey,saurabhj80/EarlGrey,ed-chin/EarlGrey,google/EarlGrey,sskhandp/EarlGrey,ed-chin/EarlGrey,saurabhj80/EarlGrey,google/EarlGrey,google/EarlGrey,artyom-razinov/EarlGrey,artyom-razinov/EarlGrey