Upgrade ruby version from 2.1.1 to 2.1.2 in travis.yml
Upgrade ruby version from 2.1.1 to 2.1.2 in travis.yml

sriprasanna/RapidFTR,ctumwebaze/RapidFTR,sorashiro/RapidFTR,sriprasanna/RapidFTR,tomclement/RapidFTR,mwangiann/RapidFTR,mwangiann/RapidFTR,tomclement/RapidFTR,austiine04/RapidFTR,austiine04/RapidFTR,tomclement/RapidFTR,sorashiro/RapidFTR,sriprasanna/RapidFTR,mwangiann/RapidFTR,timothyakampa/RapidFTR,rapidftr/RapidFTR,ctumwebaze/RapidFTR,rapidftr/RapidFTR,timothyakampa/RapidFTR,sorashiro/RapidFTR,sorashiro/RapidFTR,ctumwebaze/RapidFTR,austiine04/RapidFTR,rapidftr/RapidFTR,sriprasanna/RapidFTR,ctumwebaze/RapidFTR,mwangiann/RapidFTR,timothyakampa/RapidFTR,tomclement/RapidFTR,rapidftr/RapidFTR,austiine04/RapidFTR,timothyakampa/RapidFTR